APA

United States, . (1986). This is your General Aviation District Office, Springfield, Illinois. [Washington, D.C.]: .

Chicago

United States, . 1986. This is your General Aviation District Office, Springfield, Illinois. [Washington, D.C.]: .

Harvard

United States, . (1986). This is your General Aviation District Office, Springfield, Illinois. [Washington, D.C.]: .

MLA

United States, . This is your General Aviation District Office, Springfield, Illinois. [Washington, D.C.]: . 1986.