APA

United States, . (1991). Low-cost ultrasound equipment. [Washington, D.C.]: Department of Health and Human Services, Office of Inspector General.

Chicago

United States, . 1991. Low-cost ultrasound equipment. [Washington, D.C.]: Department of Health and Human Services, Office of Inspector General.

Harvard

United States, . (1991). Low-cost ultrasound equipment. [Washington, D.C.]: Department of Health and Human Services, Office of Inspector General.

MLA

United States, . Low-cost ultrasound equipment. [Washington, D.C.]: Department of Health and Human Services, Office of Inspector General. 1991.