Gropper, G. L. (1991). Text displays: Analysis and systematic design. Educational Technology Publications.
Citace podle Chicago (17th ed.)Gropper, George Leonard. Text Displays: Analysis and Systematic Design. Englewood Cliffs, N.J.: Educational Technology Publications, 1991.
Citace podle MLA (8th ed.)Gropper, George Leonard. Text Displays: Analysis and Systematic Design. Educational Technology Publications, 1991.
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