APA (7th ed.) Citation

Johannes de Sacrobosco. (1558). Libellus de sphaera. Crato.

Chicago Style (17th ed.) Citation

Johannes de Sacrobosco. Libellus De Sphaera. Vitebergae: Crato, 1558.

MLA (9th ed.) Citation

Johannes de Sacrobosco. Libellus De Sphaera. Crato, 1558.

Warning: These citations may not always be 100% accurate.