S.D. van Veen, 'Vorst, vörst, Konrad (Conradus Vorstius)', in S.M. Jackson (ed.), The New Schaff-Herzog Encyclopedia of Religious Knowledge, 13 vols (Funk and Wagnalls Company, New York and London 1912), XII: Trench-Zwingli, p. 227 (Internet Archive).
biblicalcyclopedia.com
Strong, James; McClintock, John. "Vorstius (Voorst), Conrad". The Cyclopedia of Biblical, Theological, and Ecclesiastical Literature. Harper and Brothers: New York, 1880. Retrieved 11 April 2017.
books.google.com
'Vorstius, Conrad', in J.H. Zedler, Grosses vollständiges Universal Lexicon Aller Wissenschaften und Künste (Verlegts Johann Heinrich Zedler, Leipzig und Halle 1746), Vol. 50: Vo-Vrh, pp. 1290-1310 (Google). In German and Latin. Zedler draws substantially on Gualtherus.
'151. Conrad Vorstius (or Vorst)', in R. Wallace, AntiTrinitarian Biography: Or, Sketches of the Lives and Writings of Distinguished Anti-Trinitarians, 3 vols (E.T. Whitfield, London 1850), II, pp. 444-54 (Google).
J. Nichols, The Works of James Arminius, D.D., 3 vols (Longman, Hurst, Rees, Orme, Brown and Green, London 1825), I, at pp. 214-16, note (Google).
For a better explanation, see J. Rohls, 'Calvinism, Arminianism and Socinianism in the Netherlands until the Synod of Dort', in M. Mulslow and J. Rohls (eds), Socinianism And Arminianism: Antitrinitarians, Calvinists, And Cultural Exchange in Seventeenth-Century Europe (Brill, Leiden and Boston 2005), pp. 3-48, esp. at pp. 24-25 (Google).
C. Vorstius, Tractatus Theologicus de Deo, sive de natura et attributis Dei (Theophilus Caesar, Steinfurt 1606), Read at Google; 1610 edition, Read at Martin-Luther-Universität, Halle-Wittenburg. Zedler lists (as No. 8) Disputationes X de natura et attributis Dei published at Steinfurt in 1602: a book of similar title by Gregor Schoenfeldt was published under Wilhelm Heinrich von Bentheim's auspices by Wesselius at Cassel in 1599 (Worldcat).
Nichols, Works of James Arminius, I, pp. 202-36 (Google).
S. Mortimer, Reason and Religion in the English Revolution: The Challenge of Socinianism (Cambridge University Press, 2010), pp. 46-48 (Google).
C. Vorstius, Epitome exegeseos Apologeticae, seu Brevis Declaratio articulorum aliquot ex Tractatu de Deo excerptorum, (&c.), (Theophilus Caesar, Steinfurt 1611). Read at Google.
F. Socinus, De Auctoritate S. Scripturae: opusculum his temporibus nostris utilissimum: quemadmodum intelligi potest ex praecipuis rerum (&c.). Read (under imprimatur of the Socinian printer "Sebastian Sternacius, Raców, 1611") at Google, but listed in Worldcat as of "Theophilus Caesar, Steinfurt 1611".
C. Sandius, Bibliotheca Anti-Trinitariorum: sive Catalogus Scriptorum, &c. op. posth. (Apud Johannem Aconium, Freistad 1684), pp. 98-99 (Google).
Nichols, Works of James Arminius, I, p. 465 (Google).
James R., A Declaration Concerning the Proceedings with the States Generall of the United Provinces of the Low Countreys, in the Cause of D. Conradus Vorstius, in James (Montague) (ed.), The Workes of the Most High and Mighty Prince Iames (Robert Barker and John Bill, cum privilegio, London 1616), at pp. 347-80 (Google).
James R., 'A Declaration', Works, at p. 365 (Google).
James R., 'A Declaration', Works, at pp. 351-54 (Google)
James R., 'A Declaration', Works, at pp. 354-64 (Google).
James R., 'A Declaration', Works, at pp. 359-60 (Google).
D. Wootton, Paolo Sarpi: Between Renaissance and Enlightenment (Cambridge University Press, 2002), pp. 90-92 (Google). ISBN 978-0-521-89234-6
C. Vorstius, Christiana ac modesta responsio ad articulos quosdam nuper ex Anglia transmissos (Thomas Basson, Leiden 1611). Read at Google.
Ad Conradi Vorstii, S. Theol. D. Amicam Collationem, Etc. Notae Johan. Piscatoris, Professoris S. literarum in illustri schola Nassovica Herbornensi (Herbornae Nassoviorum, 1613). Read at Google.
A. Mühling, 'Arminius und die Herborner Theologen: am Beispiel von Johannes Piscator', in K.D. Stanglin, M. Tolsma and Th. M. van Leeuwen (eds), Arminius, Arminianism and Europe: Jacob Arminius (1559/60-1609), (Brill, Leiden 2009), pp. 115-34, at p. 130 (Google).
H.-J. Van Dam, 'De Imperio Summarum Potestatum Circa Sacra', in H.J.M. Nellen and E. Rabbie (eds), Hugo Grotius Theologian – Essays in Honor of G.H.M. Posthumus Meyjes (E.J. Brill, New York 1994), pp. 19-40 (Google).
C. Vorstius, Amica Duplicatio ad Johannis Piscatoris, Theologi Herbornensis, Apologeticam Responsionem (&c.) (Apud Andream Burier, Gouda 1617). Read at Google.
C. Vorstius, Apologetica responsio ad ea omnia, quæ Festus Hommius nominatim (&c.) (1618). Read at Google.
Nichols, Works of James Arminius, I, pp. 409-515, at pp. 496-503, note (Google).
A. Milton (ed.), The British Delegation and the Synod of Dort (1618-1619), Church of England Record Society 13 (The Boydell Press, Woodbridge 2006), Introduction, pp. xli-xlii (Google).
Golden Remains, of the Ever Memorable Mr. John Hales, 3rd Impression, with additions (G. Pawlet, London 1688), pp. 546-48 (Google).
For a translation of the testament, see Nichols, Works of James Arminius, I, at p. 217, note (Google).
Nichols, Works of James Arminius, I, p. 204, note (Google).
dfg-viewer.de
Marcus Gualtherus, De Vita Et Obitu Reverendi, Clarissimi & doctissimi viri, Dn. Conradi Vorstii SS. Theologiae Doctoris, qui pie & placide expiravit Tonningae, 29 Septemb: Anni 1622. & postridie Calend. Octobr. honorifice in nova Holsatiae Fridericopoli terrae mandatus est, Oratio (1624). Read at Goettingen University: Zentrales Verzeichnis Digitalisierte Drucke, DFG-Viewer (Funeral oration, in Latin).
Given in full in Gualtherus, De Vita et Obitu (1624), at pp. 43-46, pp. 46-52 in reader (DFG-Viewer).
W.K. Jordan, The Development of Religious Toleration in England, 4 vols (Harvard University Press, Cambridge, Mass. 1932-1940), II: 1603-1640, pp. 334-37 (Hathi Trust).
oclc.org
opc-kb.oclc.org
Gualtherus, Album Amicorum, Manuscript, with entries from the years 1593 to 1624 and 1649. The "Stammbuch", containing 194 entries with 23 coloured armorial illustrations, was acquired in 1937 by purchase from the Antiquariaat Meyer Elte for the Royal Library of the Netherlands in The Hague, Shelf-mark 133 L 8.
prdl.org
Among Vorstius's works, Zedler (Universal Lexicon, vol. 50, p. 1307) listed (as No. 17) a reply to the Heidelberg theologians entitled (C. Vorstius), Protestatio Epistolica contra Theologorum Heidelbergensium de Tractatu suo de Deo Censuram (The Hague, 1610). No such title is listed in Worldcat, or in the Post Reformation Digital Library.
tandfonline.com
H. Helmers, 'English public diplomacy in the Dutch Republic, 1609-1619', The Seventeenth Century, Vol. XXXVI (2021), Issue 3: K. van Gelder and N. Lamal (eds), Cultural and Public Diplomacy in Seventeenth Century Europe, pp. 413-37. Read at Taylor and Francis online.
P. Pareus, 'Narratio Historica De Vita Et Obitu D. Davidis Parei' (unpaginated), in Davidis Parei... Operum Theologicorum Tomus (In Bibliopolio haeredum Ionae Rosae, Vaenit 1628), pp. 17-40 in reader, at pp. (32-33) in reader (Martin-Luther-Universität Halle-Wittenburg: Universitats- und Landesbibliothek Sachsen-Anhalt). (In Latin: Recited in Zedler).
C. Vorstius, Tractatus Theologicus de Deo, sive de natura et attributis Dei (Theophilus Caesar, Steinfurt 1606), Read at Google; 1610 edition, Read at Martin-Luther-Universität, Halle-Wittenburg. Zedler lists (as No. 8) Disputationes X de natura et attributis Dei published at Steinfurt in 1602: a book of similar title by Gregor Schoenfeldt was published under Wilhelm Heinrich von Bentheim's auspices by Wesselius at Cassel in 1599 (Worldcat).