APA (7e ed.) Bronvermelding

(1990). Centuries of tutoring: History of alternative education in America and western Europe / by Edward E. Gordon with Elaine H. Gordon.

Chicago (17e ed.) Bronvermelding

Centuries of Tutoring: History of Alternative Education in America and Western Europe / by Edward E. Gordon with Elaine H. Gordon. 1990.

MLA (9e ed.) Bronvermelding

Centuries of Tutoring: History of Alternative Education in America and Western Europe / by Edward E. Gordon with Elaine H. Gordon. 1990.