Allied air offensive against Germany : up to January 1st, 1941.
MLA
Office, Great Britain. Her Majesty's Stationery. Allied Air Offensive against Germany : up to January 1st, 1941. H.M. Stationery Office, 0AD. https://collections.library.yale.edu/catalog/15479706.
APA, 6th edition
Office, G. B. H. M. S. (0 C.E.). Allied air offensive against Germany : up to January 1st, 1941. [Maps]. H.M. Stationery Office, https://collections.library.yale.edu/catalog/15479706.