Cita APA (7th ed.)

Langlois, C., & Seignobos, C. Introduction to the Study of History. Holt and Company.

Cita Chicago (17th ed.)

Langlois, Ch.V, i Ch Seignobos. Introduction to the Study of History. New York: Holt and Company.

Cita MLA (8th ed.)

Langlois, Ch.V, i Ch Seignobos. Introduction to the Study of History. Holt and Company.