Cita APA (7th ed.)

Duffy, J. (1962). Portugal's African territories: Present realities. s.n.

Cita Chicago (17th ed.)

Duffy, James. Portugal's African Territories: Present Realities. New York: s.n, 1962.

Cita MLA (9th ed.)

Duffy, James. Portugal's African Territories: Present Realities. s.n, 1962.