APA (7th ed.) Citation

United States. Post Office Department. (1932). Parcel post or 4th-class mail; rates of postage, classification, insurance and C.O.D. features, wrapping, et cetera. GPO.

Chicago Style (17th ed.) Citation

United States. Post Office Department. Parcel Post or 4th-class Mail; Rates of Postage, Classification, Insurance and C.O.D. Features, Wrapping, Et Cetera. [Washington]: GPO, 1932.

MLA (9th ed.) Citation

United States. Post Office Department. Parcel Post or 4th-class Mail; Rates of Postage, Classification, Insurance and C.O.D. Features, Wrapping, Et Cetera. GPO, 1932.