United States. Post Office Department. (1928). Postage-due mail, including business reply cards and envelopes, not to be placed in direct packages or sacks made up for individual persons or concerns. GPO.
Chicago Style (17th ed.) CitationUnited States. Post Office Department. Postage-due Mail, Including Business Reply Cards and Envelopes, Not to Be Placed in Direct Packages or Sacks Made Up for Individual Persons or Concerns. [Washington]: GPO, 1928.
MLA (9th ed.) CitationUnited States. Post Office Department. Postage-due Mail, Including Business Reply Cards and Envelopes, Not to Be Placed in Direct Packages or Sacks Made Up for Individual Persons or Concerns. GPO, 1928.
Warning: These citations may not always be 100% accurate.