Citazione Stile APA (7a Edizione)
Sampey, J. R. (1911). The international lesson system: The history of its origin and development. Fleming H. Revell company.
Citazione stile Chigago Style (17a edizione)
Sampey, John Richard. The International Lesson System: The History of Its Origin and Development. New York: Fleming H. Revell company, 1911.
Citatione MLA (9a ed.)
Sampey, John Richard. The International Lesson System: The History of Its Origin and Development. Fleming H. Revell company, 1911.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.