MLA

Jefferys, Thomas, d. 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.. BRBL_00689. 25 May, 1775.. https://collections.library.yale.edu/catalog/15825310.

APA, 6th edition

Jefferys, Thomas, d. 1771. (["BRBL_00689"])(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/15825310.