Gaya APA

Services, U, D, O, H, A, H. (1998). Substance Abuse Among Older Adults . United States: U.S. Department of Health and Human Services.

Gaya MLA

Services, U.S., Department, Of, Health, And, Human. "Substance Abuse Among Older Adults". United States: U.S. Department of Health and Human Services, 1998. Koleksi Elektronik.