Cita APA (7th ed.)

MCGRAW-HILL. (1992). Mcgraw-hill encyclopedia of science and technology 19: ULC-ZYG. McGraw-Hill.

Cita Chicago (17th ed.)

MCGRAW-HILL. Mcgraw-hill Encyclopedia of Science and Technology 19: ULC-ZYG. New York: McGraw-Hill, 1992.

Cita MLA (9th ed.)

MCGRAW-HILL. Mcgraw-hill Encyclopedia of Science and Technology 19: ULC-ZYG. McGraw-Hill, 1992.