1. Standard No. 100-198 8;ANSI/HFS,1988
2. Ergonomics considerations in hand and wrist tendinitis
3. Investigation of Applied Forces in Alphanumeric Keyboard Work
4. COLOMBINI, D., OCCHIPINTI, E., MOLTENI, G., SEMERANO, D. and GRIECO, A. 1989.A Study of Muscle Activity in Workplac es with Keyboard Operations, 65–101. Milan): Ergodigit.
5. GUGGENBÜHL, U. and KRUEGER, H. Musculoskeletal strain resulting from keyboard use. Proceedings of Work with Display Units '89. Edited by: Berlinguet, L. and Berthelette, D. Elsevier Science: North-Holland.