MLA

Mayer, Tobias, 1723-1762. Helvetia tredecim statibvs liberis, quos cantones vocant composita : una cum foederatis & subjectis provinciis, ex probatissimis subsidiis. ca. 1751.. https://collections.library.yale.edu/catalog/2065586.

APA, 6th edition

Mayer, Tobias, 1723-1762. (ca. 1751.)[Helvetia tredecim statibvs liberis, quos cantones vocant composita : una cum foederatis & subjectis provinciis, ex probatissimis subsidiis]. https://collections.library.yale.edu/catalog/2065586.