Gaya APA

Holmes, N, J. et al (1979). Gateways to Science Level 3 (Teachers Edition Level 3). New York: Mcgraw-Hill Book Company, INC..

Gaya MLA

Holmes, Neal, J.. et al. "Gateways to Science Level 3". Teachers Edition Level 3 New York: Mcgraw-Hill Book Company, INC., 1979. Text.