Cita APA (7th ed.)

Porter, R. R. (1973). Defence and recognition. Butterworths; University Park Press.

Cita Chicago (17th ed.)

Porter, R. R. Defence and Recognition. London, Baltimore: Butterworths; University Park Press, 1973.

Cita MLA (8th ed.)

Porter, R. R. Defence and Recognition. Butterworths; University Park Press, 1973.