Egger, R. (1972). The President of the United States (2d ed.). McGraw-Hill.
Chicago Style aipamenaEgger, Rowland. The President of the United States. 2d ed. New York: McGraw-Hill, 1972.
MLA aipamenaEgger, Rowland. The President of the United States. 2d ed. McGraw-Hill, 1972.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.