Cita APA (7th ed.)

Gordon Walker, P. C. (1939). An outline of man's history. N.C.L.C. Pub. Society.

Cita Chicago (17th ed.)

Gordon Walker, Patrick Chrestien. An Outline of Man's History. London: N.C.L.C. Pub. Society, 1939.

Cita MLA (8th ed.)

Gordon Walker, Patrick Chrestien. An Outline of Man's History. N.C.L.C. Pub. Society, 1939.