Singe Morimoto

Effects of keyboard tray geometry on upper body posture and comfort.

Daniel E. McCrobie, A Hedge, A. Hedge, 1999, Ergonomics.

Healthy Keyboarding: Effects of Wrist Rests, Keyboard Trays, and a Preset Tiltdown System on Wrist Posture, Seated Posture, and Musculoskeletal Discomfort

Alan Hedge, Bruce R. Land, Daniel E. McCrobie, 1995 .