APA (7th ed.) Citation

Hansen, M. D. (1982). Keyboard design variables in dual task mode selection. [publisher not identified].

Chicago Style (17th ed.) Citation

Hansen, Mark Douglas. Keyboard Design Variables in Dual Task Mode Selection. [Place of publication not identified]: [publisher not identified], 1982.

MLA (9th ed.) Citation

Hansen, Mark Douglas. Keyboard Design Variables in Dual Task Mode Selection. [publisher not identified], 1982.