APA

United States, . (1981). Handbook of severe disability. [Washington, D.C.]: .

Chicago

United States, . 1981. Handbook of severe disability. [Washington, D.C.]: .

Harvard

United States, . (1981). Handbook of severe disability. [Washington, D.C.]: .

MLA

United States, . Handbook of severe disability. [Washington, D.C.]: . 1981.