APA (7th ed.) Citation

Humphreys, B., & Semkow, J. (1974). Information Sources: Programers' Tools.

Chicago Style (17th ed.) Citation

Humphreys, Barbara, and Julie Semkow. Information Sources: Programers' Tools. 1974.

MLA (9th ed.) Citation

Humphreys, Barbara, and Julie Semkow. Information Sources: Programers' Tools. 1974.

Warning: These citations may not always be 100% accurate.