Cita APA

Nye, R., & Morpurgo, J. (1970). A History of the United States (3rd ed.). Penguin.

Citación estilo Chicago

Nye, R.B, and J.E Morpurgo. A History of the United States. 3rd ed. Middlesex: Penguin, 1970.

Cita MLA

Nye, R.B, and J.E Morpurgo. A History of the United States. 3rd ed. Penguin, 1970.