Cita APA (7th ed.)

Downs, R. B. (1974). Guide to Illinois Library resources. American Library Association.

Cita Chicago (17th ed.)

Downs, Robert Bingham. Guide to Illinois Library Resources. Chicago: American Library Association, 1974.

Cita MLA (9th ed.)

Downs, Robert Bingham. Guide to Illinois Library Resources. American Library Association, 1974.