Silverthorn, J. E., & Perry, D. J. (1970). Word division manual: The fifteen thousand most used words in business communication (2a. ed.). Cincinnati: South-Western Publishing.
Chicago Style CitationSilverthorn, J. E., and Devern J. Perry. Word Division Manual: The Fifteen Thousand Most Used Words in Business Communication. 2a. ed. Cincinnati: South-Western Publishing, 1970.
MLA CitationSilverthorn, J. E., and Devern J. Perry. Word Division Manual: The Fifteen Thousand Most Used Words in Business Communication. 2a. ed. Cincinnati: South-Western Publishing, 1970.
Warning: These citations may not always be 100% accurate.