Samuel Engel (English Wikipedia)

Naville 1952, p. 145. Naville, René (1952), "Samuel Engel : premier américaniste suisse", Berner Zeitschrift für Geschichte und Heimatkunde (in French), vol. 14, pp. 145–150, doi:10.5169/seals-242410, retrieved 25 May 2021
Naville 1952, p. 146. Naville, René (1952), "Samuel Engel : premier américaniste suisse", Berner Zeitschrift für Geschichte und Heimatkunde (in French), vol. 14, pp. 145–150, doi:10.5169/seals-242410, retrieved 25 May 2021
Naville 1952, p. 147. Naville, René (1952), "Samuel Engel : premier américaniste suisse", Berner Zeitschrift für Geschichte und Heimatkunde (in French), vol. 14, pp. 145–150, doi:10.5169/seals-242410, retrieved 25 May 2021

e-periodica.ch (Global: 6,247^th place; English: low place)

Stuber 2008. Stuber, Martin (12 February 2008), "Engel, Samuel", Historisches Lexikon der Schweiz (in German), retrieved 25 May 2021

Stuber & Wyss 2013, pp. 904, 909. Stuber, Martin; Wyss, Regula (2013). "Useful Natural History? Pest Control in the Focus of the Economic Society of Bern". Scholars in Action (2 vols). The Practice of Knowledge and the Figure of the Savant in the 18th Century. Brill. pp. 891–920. ISBN 978-90-04-24390-3. JSTOR 10.1163/j.ctv1sr6k3v.43.
Savours 1984, p. 403. Savours, Ann (1984), ""A Very Interesting Point in Geography": The 1773 Phipps Expedition towards the North Pole", Arctic, 37 (4): 402–428, doi:10.14430/arctic2224, ISSN 0004-0843, JSTOR 40510304
Savours 1984, pp. 408–409. Savours, Ann (1984), ""A Very Interesting Point in Geography": The 1773 Phipps Expedition towards the North Pole", Arctic, 37 (4): 402–428, doi:10.14430/arctic2224, ISSN 0004-0843, JSTOR 40510304
Savours 1984, pp. 417–421. Savours, Ann (1984), ""A Very Interesting Point in Geography": The 1773 Phipps Expedition towards the North Pole", Arctic, 37 (4): 402–428, doi:10.14430/arctic2224, ISSN 0004-0843, JSTOR 40510304
Savours 1984, p. 422. Savours, Ann (1984), ""A Very Interesting Point in Geography": The 1773 Phipps Expedition towards the North Pole", Arctic, 37 (4): 402–428, doi:10.14430/arctic2224, ISSN 0004-0843, JSTOR 40510304
Watts 1954, p. 13. Watts, Geo. B. (1954), "The Supplément and the Table analytique et raisonnée of the Encyclopédie", The French Review, 28 (1): 4–19, ISSN 0016-111X, JSTOR 381939, retrieved 29 May 2021

Savours 1984, p. 403. Savours, Ann (1984), ""A Very Interesting Point in Geography": The 1773 Phipps Expedition towards the North Pole", Arctic, 37 (4): 402–428, doi:10.14430/arctic2224, ISSN 0004-0843, JSTOR 40510304
Savours 1984, pp. 408–409. Savours, Ann (1984), ""A Very Interesting Point in Geography": The 1773 Phipps Expedition towards the North Pole", Arctic, 37 (4): 402–428, doi:10.14430/arctic2224, ISSN 0004-0843, JSTOR 40510304
Savours 1984, pp. 417–421. Savours, Ann (1984), ""A Very Interesting Point in Geography": The 1773 Phipps Expedition towards the North Pole", Arctic, 37 (4): 402–428, doi:10.14430/arctic2224, ISSN 0004-0843, JSTOR 40510304
Savours 1984, p. 422. Savours, Ann (1984), ""A Very Interesting Point in Geography": The 1773 Phipps Expedition towards the North Pole", Arctic, 37 (4): 402–428, doi:10.14430/arctic2224, ISSN 0004-0843, JSTOR 40510304
Watts 1954, p. 13. Watts, Geo. B. (1954), "The Supplément and the Table analytique et raisonnée of the Encyclopédie", The French Review, 28 (1): 4–19, ISSN 0016-111X, JSTOR 381939, retrieved 29 May 2021