Cita APA (7th ed.)

Coggins, R. S., & Hefford, R. K. (1966). The practical geographers (2nd ed.). Longmans.

Cita Chicago (17th ed.)

Coggins, R. S., i R. K. Hefford. The Practical Geographers. 2nd ed. Victoria: Longmans, 1966.

Cita MLA (9th ed.)

Coggins, R. S., i R. K. Hefford. The Practical Geographers. 2nd ed. Longmans, 1966.