Cita APA (7th ed.)

Grolier Internartional. (1987). Grolier academic encyclopedia: Vol :12. Grolier Internartional , Academic Aremiracan.

Cita Chicago (17th ed.)

Grolier Internartional. Grolier Academic Encyclopedia: Vol :12. USA: Grolier Internartional , Academic Aremiracan, 1987.

Cita MLA (9th ed.)

Grolier Internartional. Grolier Academic Encyclopedia: Vol :12. Grolier Internartional , Academic Aremiracan, 1987.