Schaefer, R. T. (1988). Racial and ethnic groups (3rd ed.). Scott, Foresman.
Chicago Style aipamenaSchaefer, Richard T. Racial and Ethnic Groups. 3rd ed. Glenview, Ill.: Scott, Foresman, 1988.
MLA aipamenaSchaefer, Richard T. Racial and Ethnic Groups. 3rd ed. Scott, Foresman, 1988.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.