[Illustration of celestial spheres of Copernicus and Ptolemy].
MLA
[Illustration of Celestial Spheres of Copernicus and Ptolemy]. 1660. https://collections.library.yale.edu/catalog/15830590.
APA, 6th edition
[Illustration of celestial spheres of Copernicus and Ptolemy]. (1660). [Maps]. https://collections.library.yale.edu/catalog/15830590.