MLA

Dept, Zambia. Survey. Northern Rhodesia [Cartographic Material] / Compiled and Drawn in the Survey Department, Livingstone, N. Rhodesia, 1939. Reproduced by 157 ... Base Svy. Coy. ..., 0AD. https://collections.library.yale.edu/catalog/15532793.

APA, 6th edition

Dept, Z. S. (0 C.E.). Northern Rhodesia [cartographic material] / compiled and drawn in the Survey Department, Livingstone, N. Rhodesia, 1939. [Maps]. Reproduced by 157 ... Base Svy. Coy. ..., https://collections.library.yale.edu/catalog/15532793.