Cite

Fraser, optical & mathematical instrument maker at Fergusons Head, Dukes Court, St. Martins Lane, London [graphic].

MLA

Fraser, William, approximately 1720-1815. Fraser, optical & mathematical instrument maker at Fergusons Head, Dukes Court, St. Martins Lane, London [graphic].. [between 1777 and 1790]. https://collections.library.yale.edu/catalog/16929059.

APA, 6th edition

Fraser, William, approximately 1720-1815. ([between 1777 and 1790])[Fraser, optical & mathematical instrument maker at Fergusons Head, Dukes Court, St. Martins Lane, London [graphic].]. https://collections.library.yale.edu/catalog/16929059.