MLA

Division, Nigeria. Survey. Map of the Colony and Protectorate of Nigeria 1930 / Prepared under the Riection of the Surveyor-General of Nigeria. Nigeria Surveys, 1930. https://collections.library.yale.edu/catalog/15533572.

APA, 6th edition

Division, N. S. (1930). Map of the colony and protectorate of Nigeria 1930 / prepared under the riection of the Surveyor-General of Nigeria. [Maps]. Nigeria Surveys, https://collections.library.yale.edu/catalog/15533572.