Gaya APA

Holmes, N, J. et al (1974). Gateways to science Level 2 (Teacher's Edition Level 2). New York: Mcgraw-Hill Book Company, INC..

Gaya MLA

Holmes, Neal, J.. et al. "Gateways to science Level 2". Teacher's Edition Level 2 New York: Mcgraw-Hill Book Company, INC., 1974. Text.