APA (7th ed.) Citation

Saunders, H. S. G. (1944). Per ardua: The rise of British air power, 1911-1939. Oxford University Press.

Chicago Style (17th ed.) Citation

Saunders, Hilary St. George. Per Ardua: The Rise of British Air Power, 1911-1939. London: Oxford University Press, 1944.

MLA (8th ed.) Citation

Saunders, Hilary St. George. Per Ardua: The Rise of British Air Power, 1911-1939. Oxford University Press, 1944.