Wilson, L. G., & Gregg, J. R. (1930). Progressive dictation: Arranged according to the units in the Anniversary edition of the Gregg shorthand manual. The Gregg Publishing Co..
Style de citation Chicago (17e éd.)Wilson, Lilliam Grissom, et John Robert Gregg. Progressive Dictation: Arranged According to the Units in the Anniversary Edition of the Gregg Shorthand Manual. New York : Chicago [etc.]: The Gregg Publishing Co., 1930.
Style de citation MLA (8e éd.)Wilson, Lilliam Grissom, et John Robert Gregg. Progressive Dictation: Arranged According to the Units in the Anniversary Edition of the Gregg Shorthand Manual. The Gregg Publishing Co., 1930.
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