APA引文

SCHAEFER, R. T. Racial and ethnic groups.-- ed.2. Litle.

芝加哥风格引文

SCHAEFER, Richard T. Racial and Ethnic Groups.-- Ed.2. Boston: Litle.

MLA引文

SCHAEFER, Richard T. Racial and Ethnic Groups.-- Ed.2. Litle.

警告：这些引文格式不一定是100％准确.