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