National Institute of Environmental Health Sciences. (1972). Environmental health perspectives: EHP. U.S. Dept. of Health, Education, and Welfare, Public Health Service, National Institutes of Health, National Institute of Environmental Health Sciences.
Παραπομπή σε μορφή Chicago (17η εκδ.)National Institute of Environmental Health Sciences. Environmental Health Perspectives: EHP. [Research Triangle Park, N.C.]: U.S. Dept. of Health, Education, and Welfare, Public Health Service, National Institutes of Health, National Institute of Environmental Health Sciences, 1972.
Παραπομπή σε μορφή MLA (9th εκδ.)National Institute of Environmental Health Sciences. Environmental Health Perspectives: EHP. U.S. Dept. of Health, Education, and Welfare, Public Health Service, National Institutes of Health, National Institute of Environmental Health Sciences, 1972.