United States. Health Care Financing Administration. (1980). The International classification of diseases, 9th revision, clinical modification: ICD-9-CM. U.S. Dept. of Health and Human Services, Public Health Service, Health Care Financing Administration.

United States. Health Care Financing Administration. The International Classification of Diseases, 9th Revision, Clinical Modification: ICD-9-CM. Washington, D.C: U.S. Dept. of Health and Human Services, Public Health Service, Health Care Financing Administration, 1980.

United States. Health Care Financing Administration. The International Classification of Diseases, 9th Revision, Clinical Modification: ICD-9-CM. U.S. Dept. of Health and Human Services, Public Health Service, Health Care Financing Administration, 1980.