Cita APA (7a ed.)

Horn, E., & Ashbaugh, E. J. (1935). Horn-Ashbaugh progress in spelling: Grades one to four ; incorporating the results of the most recent investigations of spelling. Lippincott.

Cita Chicago Style (17a ed.)

Horn, Ernest, y Ernest J. Ashbaugh. Horn-Ashbaugh Progress in Spelling: Grades One to Four ; Incorporating the Results of the Most Recent Investigations of Spelling. Chicago [u.a.]: Lippincott, 1935.

Cita MLA (9a ed.)

Horn, Ernest, y Ernest J. Ashbaugh. Horn-Ashbaugh Progress in Spelling: Grades One to Four ; Incorporating the Results of the Most Recent Investigations of Spelling. Lippincott, 1935.