Gaya APA

(NCHS), N, C, F, H, S. (2007). ICD-9-CM 2007 : Classification of Procedures (6). Amerika Serikat: National Center for Health Statstics (NCHS).

Gaya MLA

(NCHS), National, Center, For, Health, Statstics. "ICD-9-CM 2007 : Classification of Procedures". 6 Amerika Serikat: National Center for Health Statstics (NCHS), 2007. Text.