Grolier International. (1987). Grolier Academic Encyclopedia: Vol :2. Grolier International,Academic American.
Cita Chicago (17th ed.)Grolier International. Grolier Academic Encyclopedia: Vol :2. USA: Grolier International,Academic American, 1987.
Cita MLA (9th ed.)Grolier International. Grolier Academic Encyclopedia: Vol :2. Grolier International,Academic American, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.