MLA

Mayer, Tobias, 1723-1762. Helvetia tredecim statibvs liberis, qvos cantones vocant composita : una cum foederatis & subjectis provinciis, ex probatissimis subsidiis. a. 1751.. https://collections.library.yale.edu/catalog/2065695.

APA, 6th edition

Mayer, Tobias, 1723-1762. (a. 1751.)[Helvetia tredecim statibvs liberis, qvos cantones vocant composita : una cum foederatis & subjectis provinciis, ex probatissimis subsidiis]. https://collections.library.yale.edu/catalog/2065695.