Gaya APA

Holmes, N, J. et al (1979). Gateways to Science Level 1 (Teacher's Edition Level 1). New York: Mcgraw-Hill Book Company, INC..

Gaya MLA

Holmes, Neal, J.. et al. "Gateways to Science Level 1". Teacher's Edition Level 1 New York: Mcgraw-Hill Book Company, INC., 1979. Text.