Clemens (2008), p. 244. Clemens, Raymond (2008), "Medieval Maps in a Renaissance Context: Gregorio Dati", in Talbert, Richard J.A.; Unger, Richard Watson (eds.), Cartography in Antiquity and the Middle Ages: Fresh Perspectives, New Methods, Leiden: Koninklijke Brill NV, pp. 237–256
J.W. McCrindle, Ancient India as described by Ptolemy, London, Trubner, 1885, revised edition by Ramachandra Jain, New Delhi, Today & Tomorrow’s Printers & Publishers, 1974, p.204: “By the Great Gulf is meant the Gulf of Siam, together with the sea that stretches beyond it toward China”; Albert Herrmann, “Der Magnus Sinus und Cattigara nach Ptolemaeus”, Comptes Rendus du 15me Congrès International de Géographie, Amsterdam, 1938, Leiden, Brill, 1938, tome II, sect. IV, Géographie Historique et Histoire de la Géographie, pp.123-8.[1]
Crone, G.R. (Dec 1964). "review of Theatrum Orbis Terrarum. A Series of Atlases in Facsimile". The Geographical Journal. 130 (4): 577–578. doi:10.2307/1792324. JSTOR1792324.
“Alberico”, vol.IV, c. 169, Florence, Biblioteca Nazionale Centrale, Banco Rari 234; Sebastian Crino, "Schizzi cartografici inediti dei primi anni della scoperta dell' America", Rivista marittima, vol. LXIV, no.9, Supplemento, Novembre 1930, p.48, fig.18. Downloadable at: https://www.henry-davis.com/MAPS/Ren/Ren1/304.1.htmlArchived 2018-06-15 at the Wayback Machine
Crone, G.R. (Dec 1964). "review of Theatrum Orbis Terrarum. A Series of Atlases in Facsimile". The Geographical Journal. 130 (4): 577–578. doi:10.2307/1792324. JSTOR1792324.
“Alberico”, vol.IV, c. 169, Florence, Biblioteca Nazionale Centrale, Banco Rari 234; Sebastian Crino, "Schizzi cartografici inediti dei primi anni della scoperta dell' America", Rivista marittima, vol. LXIV, no.9, Supplemento, Novembre 1930, p.48, fig.18. Downloadable at: https://www.henry-davis.com/MAPS/Ren/Ren1/304.1.htmlArchived 2018-06-15 at the Wayback Machine