MLA

[Philip I of Austria, K. of Castile] [b. 1506 Aet. 28]. [Graphic]. publisher not identified, 0AD. https://collections.library.yale.edu/catalog/16193114.

APA, 6th edition

[Philip I of Austria, K. of Castile] [b. 1506 aet. 28]. [graphic]. (0 C.E.). [Portrait prints, Engravings England London 1797, Etchings England London 1797, Annotations (Provenance) 18th century]. publisher not identified. https://collections.library.yale.edu/catalog/16193114.