APA引文

(1969). Our presidents and their times: Social studies unit books series. Xerox Education.

Chicago Style (17th ed.) Citation

Our Presidents and Their Times: Social Studies Unit Books Series. Columbus, Ohio: Xerox Education, 1969.

MLA引文

Our Presidents and Their Times: Social Studies Unit Books Series. Xerox Education, 1969.

警告：这些引文格式不一定是100％准确.