APA (7th ed.) Citation

Downing, D. (1992). NTC's dictionary of American spelling: [the most practical reference for correct spellings of contemporary American English]. NTC National Textbook Company.

Chicago Style (17th ed.) Citation

Downing, David. NTC's Dictionary of American Spelling: [the Most Practical Reference for Correct Spellings of Contemporary American English]. Lincolnwood, Ill: NTC National Textbook Company, 1992.

MLA (9th ed.) Citation

Downing, David. NTC's Dictionary of American Spelling: [the Most Practical Reference for Correct Spellings of Contemporary American English]. NTC National Textbook Company, 1992.