United States. Post Office Department. (1912). Postal laws and regulations pertaining to 2nd class of mail matter (corrected to Feb. 1, 1912). [publisher not identified].
Chicago Style (17th ed.) CitationUnited States. Post Office Department. Postal Laws and Regulations Pertaining to 2nd Class of Mail Matter (corrected to Feb. 1, 1912). [Washington]: [publisher not identified], 1912.
MLA (9th ed.) CitationUnited States. Post Office Department. Postal Laws and Regulations Pertaining to 2nd Class of Mail Matter (corrected to Feb. 1, 1912). [publisher not identified], 1912.
Warning: These citations may not always be 100% accurate.