United States. Department of Health, Education, and Welfare. (1929). Studies in natural illumination in school rooms: Part III. Effect of clouds on daylight illumination and on daylight ratios. GPO.
Chicago Style (17th ed.) CitationUnited States. Department of Health, Education, and Welfare. Studies in Natural Illumination in School Rooms: Part III. Effect of Clouds on Daylight Illumination and on Daylight Ratios. [Washington]: GPO, 1929.
MLA (9th ed.) CitationUnited States. Department of Health, Education, and Welfare. Studies in Natural Illumination in School Rooms: Part III. Effect of Clouds on Daylight Illumination and on Daylight Ratios. GPO, 1929.
Warning: These citations may not always be 100% accurate.