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..
Chicago-viite (17. p.)Wilson, Lilliam Grissom, ja 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.
MLA-viite (8. p.)Wilson, Lilliam Grissom, ja 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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