Cita APA (7a ed.)

Dury, G. H., & Mathieson, R. (1970). The United States and Canada. Heinemann Educational.

Cita Chicago Style (17a ed.)

Dury, G. H., y R.S Mathieson. The United States and Canada. London: Heinemann Educational, 1970.

Cita MLA (9a ed.)

Dury, G. H., y R.S Mathieson. The United States and Canada. Heinemann Educational, 1970.