Schaefer, R. T. (1988). Racial and ethnic groups (3ª ed.). Scott, Foresman.
Cita Chicago (17th ed.)Schaefer, Richard T. Racial and Ethnic Groups. 3ª ed. Scott, Foresman, 1988.
Cita MLA (9th ed.)Schaefer, Richard T. Racial and Ethnic Groups. 3ª ed. Scott, Foresman, 1988.
Atenció: Aquestes cites poden no estar 100% correctes.