Cita APA (7a ed.)

Dury, G. H., & Mathieson, R. S. (1976). The United States and Canada (2nd ed.). Heinemann Educational.

Cita Chicago Style (17a ed.)

Dury, G. H., y R. S. Mathieson. The United States and Canada. 2nd ed. London: Heinemann Educational, 1976.

Cita MLA (9a ed.)

Dury, G. H., y R. S. Mathieson. The United States and Canada. 2nd ed. Heinemann Educational, 1976.