MLA

Philip, George, and Son. Specimen Map from Philips' International Atlas : Indian Empire with Ceylon - General / London Geographical Institute. George Philip & Son, 0AD. https://collections.library.yale.edu/catalog/15952182.

APA, 6th edition

Philip, G., & S. (0 C.E.). Specimen map from Philips' international atlas : Indian empire with Ceylon - general / London Geographical Institute. [Maps]. George Philip & Son, https://collections.library.yale.edu/catalog/15952182.