McCormack, Robert L. (2009). "Man with a Mission: Oswald Pirow and South African Airways, 1933–1939". The Journal of African History. 20 (4): 543–557. doi:10.1017/S0021853700017539. ISSN0021-8537.
McCormack, Robert L. (2009). "Man with a Mission: Oswald Pirow and South African Airways, 1933–1939". The Journal of African History. 20 (4): 543–557. doi:10.1017/S0021853700017539. ISSN0021-8537.