APA (7th ed.) Citation

Penrose, H. (1979). British aviation : widening horizons 1930-1934: Widening horizons 1930-1934. H.M.S.O..

Chicago Style (17th ed.) Citation

Penrose, Harald. British Aviation : Widening Horizons 1930-1934: Widening Horizons 1930-1934. London: H.M.S.O., 1979.

MLA (9th ed.) Citation

Penrose, Harald. British Aviation : Widening Horizons 1930-1934: Widening Horizons 1930-1934. H.M.S.O., 1979.

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