G. Freeman

The Effects of Concurrent Vocalization on Foot and Hand Motor Performance: A Test of the Functional Distance Hypothesis

Clint A. Bowers, Richard C. LaBarba, Sheryl A. Kingsberg, 1987, Cortex.

Psychomotor performance: the effects of continuous noise and augmented feedback.

C. Mackay, T. Cox, G. Freeman, 1978, Applied ergonomics.