(1977). Readability of alphanumeric characters having various contrast levels as a function of age and illumination mode / Kenneth W. Welsh Paul G. Rasmussen, and John A. Vaughan ; Civil Aeromedical Institute, Federal Aviation Administration, Oklahoma City, Oklahoma.
Chicago-čujuhus (17. p.)Readability of Alphanumeric Characters Having Various Contrast Levels as a Function of Age and Illumination Mode / Kenneth W. Welsh Paul G. Rasmussen, and John A. Vaughan ; Civil Aeromedical Institute, Federal Aviation Administration, Oklahoma City, Oklahoma. 1977.
MLA-čujuhus (9. p.)Readability of Alphanumeric Characters Having Various Contrast Levels as a Function of Age and Illumination Mode / Kenneth W. Welsh Paul G. Rasmussen, and John A. Vaughan ; Civil Aeromedical Institute, Federal Aviation Administration, Oklahoma City, Oklahoma. 1977.