Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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