(en) Hickok, William Eugene, 1858-, The Correspondent's Manual; a Praxis for Stenographers, Typewriter Operators, and Clerks; Comprising Some Practical Information on Letter Taking and Letter Writing Hints how to Do It and how not to Do It (1902), Boston. Lee and Shepard (lire en ligne)
(en) So Relle, Rupert Pitt, 1871-1937; Gregg, John Robert, 1867-1948, Secretarial Studies ([c.1922]), New York, Chicago, etc. The Gregg publishing company (lire en ligne)