Haynes, B. R. 1. Secretarial problems, a work book on the collegiate level.
Lua i Stíl Chicago (17ú heag.)Haynes, Benjamin Rudolph 1897. Secretarial Problems, a Work Book on the Collegiate Level. New York, Chicago, etc., The Gregg publishing company, 1931.
Lua MLA (9ú heag.)Haynes, Benjamin Rudolph 1897. Secretarial Problems, a Work Book on the Collegiate Level.
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