MLA

Alfonso X, King of Castile and Leon, 1221-1284. Tabulae astronomicae, with brief extracts from Canones in tabulas Alphonsi regis, by Johannes (Dank) de Saxonia, and with a few anonymous additions. [ca. 1500]. https://collections.library.yale.edu/catalog/33071427.

APA, 6th edition

Alfonso X, King of Castile and Leon, 1221-1284. ([ca. 1500])[Tabulae astronomicae, with brief extracts from Canones in tabulas Alphonsi regis, by Johannes (Dank) de Saxonia, and with a few anonymous additions]. https://collections.library.yale.edu/catalog/33071427.