APA

National Institutes of Health U.S, . (1993). Environmental health perspectives. Research Triangle Park, N.C: U.S. Dept. of Health and Human Services, Public Health Service, National Institute of Envirenmental Health Sciences.

Chicago

National Institutes of Health U.S, . 1993. Environmental health perspectives. Research Triangle Park, N.C: U.S. Dept. of Health and Human Services, Public Health Service, National Institute of Envirenmental Health Sciences.

Harvard

National Institutes of Health U.S, . (1993). Environmental health perspectives. Research Triangle Park, N.C: U.S. Dept. of Health and Human Services, Public Health Service, National Institute of Envirenmental Health Sciences.

MLA

National Institutes of Health U.S, . Environmental health perspectives. Research Triangle Park, N.C: U.S. Dept. of Health and Human Services, Public Health Service, National Institute of Envirenmental Health Sciences. 1993.