Cita APA (7a ed.)

Rugg, H. O., & Krueger, L. (1936). Peoples and Countries. Ginn.

Cita Chicago Style (17a ed.)

Rugg, Harold Ordway, y Louise Krueger. Peoples and Countries. Boston [u.a.]: Ginn, 1936.

Cita MLA (9a ed.)

Rugg, Harold Ordway, y Louise Krueger. Peoples and Countries. Ginn, 1936.