APA (7th ed.) Citation
Schaefer, R. T. (1990). Racial and ethnic groups (4th ed.). Harper Collins.
Chicago Style (17th ed.) Citation
Schaefer, Richard T. Racial and Ethnic Groups. 4th ed. USA: Harper Collins, 1990.
MLA (9th ed.) Citation
Schaefer, Richard T. Racial and Ethnic Groups. 4th ed. Harper Collins, 1990.
Warning: These citations may not always be 100% accurate.