Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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