APA

Kovar M. G., Forbes W. F. & National Center for Health Statistics U.S. (1994). Disability among older people: United States and Canada. Hyattsville, Md: U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control, National Center for Health Statistics.

Chicago

Kovar Mary Grace, Forbes William F and National Center for Health Statistics U.S. 1994. Disability among older people: United States and Canada. Hyattsville, Md: U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control, National Center for Health Statistics.

Harvard

Kovar M. G., Forbes W. F. and National Center for Health Statistics U.S. (1994). Disability among older people: United States and Canada. Hyattsville, Md: U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control, National Center for Health Statistics.

MLA

Kovar Mary Grace, Forbes William F and National Center for Health Statistics U.S. Disability among older people: United States and Canada. Hyattsville, Md: U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control, National Center for Health Statistics. 1994.