Παραπομπή σε μορφή APA (7η εκδ.)

Ruskin, R. S. (1974). The personalized system of instruction: An educational alternative. Americam Association for Higher Education.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Ruskin, Robert S. The Personalized System of Instruction: An Educational Alternative. Washington, D.C.: Americam Association for Higher Education, 1974.

Παραπομπή σε μορφή MLA (9th εκδ.)

Ruskin, Robert S. The Personalized System of Instruction: An Educational Alternative. Americam Association for Higher Education, 1974.