MLA

Jefferys, Thomas, -1771. An exact chart of the river St. Laurence : from Fort Frontenac to the island of Anticosti shewing the soundings, rocks, shoals &c. with views of the lands and all necessary instructions for navigating that river to Quebec / by ... Thos. Jefferys.. 25 May, 1775.. https://collections.library.yale.edu/catalog/16664839.

APA, 6th edition

Jefferys, Thomas, -1771. (25 May, 1775.)[An exact chart of the river St. Laurence : from Fort Frontenac to the island of Anticosti shewing the soundings, rocks, shoals &c. with views of the lands and all necessary instructions for navigating that river to Quebec / by ... Thos. Jefferys.]. https://collections.library.yale.edu/catalog/16664839.