Cita APA (7th ed.)

Rugg, H., & Krueger, L. (1938). Mankind throughout the ages. Ginn and Company.

Cita Chicago (17th ed.)

Rugg, Harold, i Louise Krueger. Mankind Throughout the Ages. Boston: Ginn and Company, 1938.

Cita MLA (9th ed.)

Rugg, Harold, i Louise Krueger. Mankind Throughout the Ages. Ginn and Company, 1938.