Cita APA (7th ed.)

Grolier international. (1987). Grolier academic encyclopedia: Vol :15. Grolier international, Acamedic American.

Cita Chicago (17th ed.)

Grolier international. Grolier Academic Encyclopedia: Vol :15. USA: Grolier international, Acamedic American, 1987.

Cita MLA (9th ed.)

Grolier international. Grolier Academic Encyclopedia: Vol :15. Grolier international, Acamedic American, 1987.