Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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