Cita APA (7a ed.)
Fergus, P. M. (1964). Spelling improvement: A program for self-instruction. McGraw-Hill.
Cita Chicago Style (17a ed.)
Fergus, Patricia M. Spelling Improvement: A Program for Self-instruction. New York: McGraw-Hill, 1964.
Cita MLA (9a ed.)
Fergus, Patricia M. Spelling Improvement: A Program for Self-instruction. McGraw-Hill, 1964.
Precaución: Estas citas no son 100% exactas.