APA (7th ed.) Citation

Penrose, H. (1980). British aviation : the ominous skies, 1935-1939 / (by) Harald Penrose: The ominous skies, 1935-1939. H.M.S.O..

Chicago Style (17th ed.) Citation

Penrose, Harald. British Aviation : The Ominous Skies, 1935-1939 / (by) Harald Penrose: The Ominous Skies, 1935-1939. London: H.M.S.O., 1980.

MLA (9th ed.) Citation

Penrose, Harald. British Aviation : The Ominous Skies, 1935-1939 / (by) Harald Penrose: The Ominous Skies, 1935-1939. H.M.S.O., 1980.

Warning: These citations may not always be 100% accurate.