Tuscia [cartographic material] / per Gerardum Mercatorem.
MLA
Tuscia [Cartographic Material] / per Gerardum Mercatorem. 0AD. https://collections.library.yale.edu/catalog/15494110.
APA, 6th edition
Tuscia [cartographic material] / per Gerardum Mercatorem. (0 C.E.). [Maps]. https://collections.library.yale.edu/catalog/15494110.