United States. Department of Health, Education, and Welfare. (1929). Studies in illumination: II. Relationship of illumination to ocular efficiency and ocular fatigue among letter separators in Chicago post office. GPO.
Chicago Style (17th ed.) CitationUnited States. Department of Health, Education, and Welfare. Studies in Illumination: II. Relationship of Illumination to Ocular Efficiency and Ocular Fatigue Among Letter Separators in Chicago Post Office. [Washington]: GPO, 1929.
MLA (9th ed.) CitationUnited States. Department of Health, Education, and Welfare. Studies in Illumination: II. Relationship of Illumination to Ocular Efficiency and Ocular Fatigue Among Letter Separators in Chicago Post Office. GPO, 1929.
Warning: These citations may not always be 100% accurate.