Gaya APA

McGraw-Hill, . (1987). McGraw-Hill encyclopedia of science & technology [vol. 08] GEO-HYS (ed. 6). New York: Pradnya Paramita.

Gaya MLA

McGraw-Hill, . "McGraw-Hill encyclopedia of science & technology [vol. 08] GEO-HYS". ed. 6 New York: Pradnya Paramita, 1987. Text.