APA-referens (7:e uppl.)

WILLIAMS, G. A., BOLEN, M. C., & DOERHOFF Ray B. (1973). Challenges to science physical science. Wbster Division, McGraw-Hill Book Company.

Chicago-referens (17:e uppl.)

WILLIAMS, George A., Max C. BOLEN, och DOERHOFF Ray B. Challenges to Science Physical Science. New York: Wbster Division, McGraw-Hill Book Company, 1973.

MLA-referens (9:e uppl.)

WILLIAMS, George A., et al. Challenges to Science Physical Science. Wbster Division, McGraw-Hill Book Company, 1973.