Cita APA (7a ed.)

Dobson, F. R., & Virgo, H. E. (1974). Canada and the United States. English Universities Press Limited.

Cita Chicago Style (17a ed.)

Dobson, F. R., y H. E. Virgo. Canada and the United States. London: English Universities Press Limited, 1974.

Cita MLA (9a ed.)

Dobson, F. R., y H. E. Virgo. Canada and the United States. English Universities Press Limited, 1974.