MLA

Freducci, Conte di Ottomano, active 1497-1539, cartographer. Composite atlas of portolan charts produced by Conte di Ottomano Freducci. [1536?]. https://collections.library.yale.edu/catalog/16823430.

APA, 6th edition

Freducci, Conte di Ottomano, active 1497-1539, cartographer. ([1536?])[Composite atlas of portolan charts produced by Conte di Ottomano Freducci]. https://collections.library.yale.edu/catalog/16823430.