Cite

Recent explorations in southern Nigeria / by Lieut. E.A. Steel, 1904-7.

MLA

Steel, E. A., and Lieut. Recent Explorations in Southern Nigeria / by Lieut. E.A. Steel, 1904-7. Royal Geographical Society, 1908. https://collections.library.yale.edu/catalog/15952195.

APA, 6th edition

Steel, E. A., & L. (1908). Recent explorations in southern Nigeria / by Lieut. E.A. Steel, 1904-7. [Maps]. Royal Geographical Society, https://collections.library.yale.edu/catalog/15952195.