Cita APA (7th ed.)

Porter, R. I. (1977). A school course in vectors. G. Bell & Sons.

Cita Chicago (17th ed.)

Porter, R. I. A School Course in Vectors. London: G. Bell & Sons, 1977.

Cita MLA (9th ed.)

Porter, R. I. A School Course in Vectors. G. Bell & Sons, 1977.