APA stil citiranja

Ledgard, H. (1981). Directions in human factors for interactive systems: Directions in human factors for interactive systems (1. izd.). Berlin: Springer Verlag.

Chicago stil citiranja

Ledgard, Henry. Directions in human factors for interactive systems: Directions in human factors for interactive systems. 1. izd. Berlin: Springer Verlag, 1981.

MLA stil citiranja

Ledgard, Henry. Directions in human factors for interactive systems: Directions in human factors for interactive systems. 1. izd. Berlin: Springer Verlag, 1981.