APA (7th ed.) Citation

Comaromi, J. P. (1989). Dewey decimal classification and relative index (20th ed.). Forest Press.

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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