Cite

De utilitatibus astrolabii

MLA

Hermannus, Contractus, 1013-1054. De utilitatibus astrolabii. [between 1190 and 1200]. https://collections.library.yale.edu/catalog/30536729.

APA, 6th edition

Hermannus, Contractus, 1013-1054. ([between 1190 and 1200])[De utilitatibus astrolabii]. https://collections.library.yale.edu/catalog/30536729.