APA (7th ed.) Citation

Fergus, P. M. (1991). Spelling improvement: A program for self-instruction (5th ed.). Mc Graw Hill.

Chicago Style (17th ed.) Citation

Fergus, Patricia M. Spelling Improvement: A Program for Self-instruction. 5th ed. New York: Mc Graw Hill, 1991.

MLA (8th ed.) Citation

Fergus, Patricia M. Spelling Improvement: A Program for Self-instruction. 5th ed. Mc Graw Hill, 1991.