APA

National Library of Medicine U.S, . (1998). Medline Plus: trusted health information for you. Bethesda, Md: U.S. National Library of Medicine, National Institutes of Health, Dept. of Health & Human Services.

Chicago

National Library of Medicine U.S, . 1998. Medline Plus: trusted health information for you. Bethesda, Md: U.S. National Library of Medicine, National Institutes of Health, Dept. of Health & Human Services.

Harvard

National Library of Medicine U.S, . (1998). Medline Plus: trusted health information for you. Bethesda, Md: U.S. National Library of Medicine, National Institutes of Health, Dept. of Health & Human Services.

MLA

National Library of Medicine U.S, . Medline Plus: trusted health information for you. Bethesda, Md: U.S. National Library of Medicine, National Institutes of Health, Dept. of Health & Human Services. 1998.