MLA

Homann Erben (Firm), Sperges, Joseph, Freiherr von, 1725-1791. Tyrolis pars meridionalis cum Espicopatu Tridentino finitimisque vallibus et limitibus Venetis [cartographic material] / accurate descripta a Iosepho de Spergs in Palenz et Reisdorf. [ca. 1762?]. https://collections.library.yale.edu/catalog/2065601.

APA, 6th edition

Homann Erben (Firm), & Sperges, Joseph, Freiherr von, 1725-1791. ([ca. 1762?])[Tyrolis pars meridionalis cum Espicopatu Tridentino finitimisque vallibus et limitibus Venetis [cartographic material] / accurate descripta a Iosepho de Spergs in Palenz et Reisdorf]. https://collections.library.yale.edu/catalog/2065601.