Schaefer, R. T. (1988). Racial and ethnic groups (3rd ed.). Scott, Foresman.
Lua i Stíl Chicago (17ú heag.)Schaefer, Richard T. Racial and Ethnic Groups. 3rd ed. Glenview, Ill.: Scott, Foresman, 1988.
Lua MLA (8ú heag.)Schaefer, Richard T. Racial and Ethnic Groups. 3rd ed. Scott, Foresman, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.