APA (7th ed.) Citation
Dewey, M., Mitchell, J. S., Beall, J., Matthews, W. E., & New, G. R. (1996). Dewey decimal classification and relative index (Ed. 21.). Forest Press, a division of OCLC Online Computer Library Center.
Chicago Style (17th ed.) Citation
Dewey, Melvil, Joan S. Mitchell, Julianne Beall, Winton E. Matthews, and Gregory R. New. Dewey Decimal Classification and Relative Index. Ed. 21. Albany, N.Y.: Forest Press, a division of OCLC Online Computer Library Center, 1996.
MLA (9th ed.) Citation
Dewey, Melvil, et al. Dewey Decimal Classification and Relative Index. Ed. 21. Forest Press, a division of OCLC Online Computer Library Center, 1996.
Warning: These citations may not always be 100% accurate.