APA (7th ed.) Citation

Dewey, M., & Comaromi, J. P. (1989). Dewey Decimal Classification and relative index (20th ed.). Forest Press.

Chicago Style (17th ed.) Citation

Dewey, Melvil, and John P. Comaromi. Dewey Decimal Classification and Relative Index. 20th ed. Albany: Forest Press, 1989.

MLA (8th ed.) Citation

Dewey, Melvil, and John P. Comaromi. Dewey Decimal Classification and Relative Index. 20th ed. Forest Press, 1989.