United States. Post Office Department. (1927). Use of envelopes, folders, cards, et cetera, of unusual size or irregular shape, or which bear excessive printing on address side, objectionable. GPO.
Chicago Style (17th ed.) CitationUnited States. Post Office Department. Use of Envelopes, Folders, Cards, Et Cetera, of Unusual Size or Irregular Shape, or Which Bear Excessive Printing on Address Side, Objectionable. [Washington]: GPO, 1927.
MLA (9th ed.) CitationUnited States. Post Office Department. Use of Envelopes, Folders, Cards, Et Cetera, of Unusual Size or Irregular Shape, or Which Bear Excessive Printing on Address Side, Objectionable. GPO, 1927.
Warning: These citations may not always be 100% accurate.