Brummett, P. J. (2000). Civilization past & present (9th ed.). Longman.
Cita Chicago (17th ed.)Brummett, Palmira Johnson. Civilization Past & Present. 9th ed. New York: Longman, 2000.
Cita MLA (9th ed.)Brummett, Palmira Johnson. Civilization Past & Present. 9th ed. Longman, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.