MLA

Homann Erben (Firm), Mayer, Tobias, 1723-1762. Helvetia tredecim statibvs liberis, qvos cantones vocant composita [cartographic material] : una cum foederatis & subjectis provinciis, ex probatissimis subsidiis / geographice delineata per Dm. Tobiam Mayerum, Professorem Matth., Goettingensem. a. 1751. https://collections.library.yale.edu/catalog/2065695.

APA, 6th edition

Homann Erben (Firm), & Mayer, Tobias, 1723-1762. (a. 1751)[Helvetia tredecim statibvs liberis, qvos cantones vocant composita [cartographic material] : una cum foederatis & subjectis provinciis, ex probatissimis subsidiis / geographice delineata per Dm. Tobiam Mayerum, Professorem Matth., Goettingensem]. https://collections.library.yale.edu/catalog/2065695.