APA (7th ed.) Citation

Ledgard, H. F., Singer, A., & Whiteside, J. (1981). Directions in human factors for interactive systems. Springer-Verlag.

Chicago Style (17th ed.) Citation

Ledgard, Henry F., Andrew Singer, and John Whiteside. Directions in Human Factors for Interactive Systems. Berlin ; New York: Springer-Verlag, 1981.

MLA (9th ed.) Citation

Ledgard, Henry F., et al. Directions in Human Factors for Interactive Systems. Springer-Verlag, 1981.