Saunders, H. S. G. (1944). Per ardua : the rise of British air power, 1911-1939: The rise of British air power, 1911-1939. Oxford University Press.
Chicago Style (17th ed.) CitationSaunders, Hilary St George. Per Ardua : The Rise of British Air Power, 1911-1939: The Rise of British Air Power, 1911-1939. London: Oxford University Press, 1944.
MLA (9th ed.) CitationSaunders, Hilary St George. Per Ardua : The Rise of British Air Power, 1911-1939: The Rise of British Air Power, 1911-1939. Oxford University Press, 1944.
Warning: These citations may not always be 100% accurate.