APA (7th ed.) Citation

(1981). Directions in human factors for interactive systems / Henry Ledgard, Andrew Singer, John Whiteside.

Chicago Style (17th ed.) Citation

Directions in Human Factors for Interactive Systems / Henry Ledgard, Andrew Singer, John Whiteside. 1981.

MLA (9th ed.) Citation

Directions in Human Factors for Interactive Systems / Henry Ledgard, Andrew Singer, John Whiteside. 1981.

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