APA

United States, . (1991). ICD-9-CM: the international classification of diseases. Rockville, Md: Health Care Financing Administration.

Chicago

United States, . 1991. ICD-9-CM: the international classification of diseases. Rockville, Md: Health Care Financing Administration.

Harvard

United States, . (1991). ICD-9-CM: the international classification of diseases. Rockville, Md: Health Care Financing Administration.

MLA

United States, . ICD-9-CM: the international classification of diseases. Rockville, Md: Health Care Financing Administration. 1991.