Gallagher, O. C., & Moulton, L. B. (1918). Practical business English. Houghton Miffin Company.
Lua i Stíl Chicago (17ú heag.)Gallagher, Oscar Charles, agus Leonard Bowdoin Moulton. Practical Business English. Boston : New York [etc.]: Houghton Miffin Company, 1918.
Lua MLA (8ú heag.)Gallagher, Oscar Charles, agus Leonard Bowdoin Moulton. Practical Business English. Houghton Miffin Company, 1918.
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