APA (7th ed.) Citation

Humphries, W., & Butler, F. (1970). Nurses help conduct a statistical study. Industrial Engineering, 2, 20.

Chicago Style (17th ed.) Citation

Humphries, W., and F. Butler. "Nurses Help Conduct a Statistical Study." Industrial Engineering 2 (1970): 20.

MLA (9th ed.) Citation

Humphries, W., and F. Butler. "Nurses Help Conduct a Statistical Study." Industrial Engineering, vol. 2, 1970, p. 20.