Marklin, Richard W.; Simoneau, Guy G. (2004). "Design Features of Alternative Computer Keyboards: A Review of Experimental Data". Journal of Orthopaedic & Sports Physical Therapy. 34 (10): 638–649. doi:10.2519/jospt.2004.34.10.638. PMID15552709. S2CID17996825.
Marklin, Richard W.; Simoneau, Guy G. (2004). "Design Features of Alternative Computer Keyboards: A Review of Experimental Data". Journal of Orthopaedic & Sports Physical Therapy. 34 (10): 638–649. doi:10.2519/jospt.2004.34.10.638. PMID15552709. S2CID17996825.
Marklin, Richard W.; Simoneau, Guy G. (2004). "Design Features of Alternative Computer Keyboards: A Review of Experimental Data". Journal of Orthopaedic & Sports Physical Therapy. 34 (10): 638–649. doi:10.2519/jospt.2004.34.10.638. PMID15552709. S2CID17996825.