MLA

Sacro Bosco, Joannes de, active 1230. Algorismus. approximately 1460.. https://collections.library.yale.edu/catalog/10517522.

APA, 6th edition

Sacro Bosco, Joannes de, active 1230. (approximately 1460.)[Algorismus]. https://collections.library.yale.edu/catalog/10517522.