Παραπομπή APA

Earl, B. (1963). Groups and fields: A programmed unit in modern education ed by J William Moore and Wendell I Smith.

Παραπομπή Chicago Style

Earl, Boyd. Groups and Fields: A Programmed Unit in Modern Education Ed by J William Moore and Wendell I Smith. 1963.

Παραπομπή MLA

Earl, Boyd. Groups and Fields: A Programmed Unit in Modern Education Ed by J William Moore and Wendell I Smith. 1963.