APA

United States, . (19). The budget for fiscal year 1991: scoring of GSA - lease purchases. [Washington, D.C: .

Chicago

United States, . 19. The budget for fiscal year 1991: scoring of GSA - lease purchases. [Washington, D.C: .

Harvard

United States, . (19). The budget for fiscal year 1991: scoring of GSA - lease purchases. [Washington, D.C: .

MLA

United States, . The budget for fiscal year 1991: scoring of GSA - lease purchases. [Washington, D.C: . 19.