APA (7th ed.) Citation

United States. Federal Board for Vocational Education. (1921). Penalty envelopes and labels for mailing free of postage, improper use of. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Federal Board for Vocational Education. Penalty Envelopes and Labels for Mailing Free of Postage, Improper Use of. [Washington]: [publisher not identified], 1921.

MLA (9th ed.) Citation

United States. Federal Board for Vocational Education. Penalty Envelopes and Labels for Mailing Free of Postage, Improper Use of. [publisher not identified], 1921.