APA

Angelo M. Pellegrini, . (1956). Americans by choice. New York: Macmillan.

Chicago

Angelo M. Pellegrini, . 1956. Americans by choice. New York: Macmillan.

Harvard

Angelo M. Pellegrini, . (1956). Americans by choice. New York: Macmillan.

MLA

Angelo M. Pellegrini, . Americans by choice. New York: Macmillan. 1956.