Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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