Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.