APA (7th ed.) Citation

O'Connor, R. (1968). The German-Americans: An informal history. Little [u.a.].

Chicago Style (17th ed.) Citation

O'Connor, Richard. The German-Americans: An Informal History. Boston: Little [u.a.], 1968.

MLA (9th ed.) Citation

O'Connor, Richard. The German-Americans: An Informal History. Little [u.a.], 1968.