MLA

Bock, Gregorius. Scribal Pattern Book. 0AD. https://collections.library.yale.edu/catalog/10450154.

APA, 6th edition

Bock, G. (0 C.E.). Scribal pattern book [Manuscripts, Medieval Swabia (Germany) 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/10450154.