MLA

Crawford, R. J. Topographical Map of Mount Bonar and Parts of Wanganui & Poerua Survey Districts / Compiled and Drawn by R.J. Crawford. N.Z. Geological Survey, 1908. https://collections.library.yale.edu/catalog/15824524.

APA, 6th edition

Crawford, R. J. (1908). Topographical map of Mount Bonar and parts of Wanganui & Poerua survey districts / compiled and drawn by R.J. Crawford. [Maps]. N.Z. Geological Survey, https://collections.library.yale.edu/catalog/15824524.