Cite

20. Digging trenches on the border in Texas

MLA

20. Digging Trenches on the Border in Texas. 0AD. https://collections.library.yale.edu/catalog/2017301.

APA, 6th edition

20. Digging trenches on the border in Texas. (0 C.E.). [Photographic postcards, Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2017301.