Cite

Ruins of Machu Picchi, as mapped by the expedition of 1912.

MLA

Bunstead, Albert H. Ruins of Machu Picchi, as Mapped by the Expedition of 1912. 1930. https://collections.library.yale.edu/catalog/10014262.

APA, 6th edition

Bunstead, A. H. (1930). Ruins of Machu Picchi, as mapped by the expedition of 1912. [Paper]. https://collections.library.yale.edu/catalog/10014262.