Cita APA

Dobson, F. R., & Virgo, H. E. (1970). Canada and the United States. English Univ. Press.

Citación estilo Chicago

Dobson, F. R., and H. E. Virgo. Canada and the United States. London: English Univ. Press, 1970.

Cita MLA

Dobson, F. R., and H. E. Virgo. Canada and the United States. English Univ. Press, 1970.