Algorismus
MLA
Sacro Bosco, Joannes de, fl. 1230. Algorismus. [ca. 1460]. https://collections.library.yale.edu/catalog/10517522.
APA, 6th edition
Sacro Bosco, Joannes de, fl. 1230. ([ca. 1460])[Algorismus]. https://collections.library.yale.edu/catalog/10517522.