Cita APA (7th ed.)
Sampey, J. R. (1911). The international lesson system: The history of its origin and development. Fleming H. Revell company.
Cita Chicago (17th ed.)
Sampey, John Richard. The International Lesson System: The History of Its Origin and Development. New York: Fleming H. Revell company, 1911.
Cita MLA (9th ed.)
Sampey, John Richard. The International Lesson System: The History of Its Origin and Development. Fleming H. Revell company, 1911.
Atenció: Aquestes cites poden no estar 100% correctes.