APA (7th ed.) Citation

Dewey, M. Dewey decimal classification and relative index (Ed. 21.). Forest Press.

Chicago Style (17th ed.) Citation

Dewey, Melvil. Dewey Decimal Classification and Relative Index. Ed. 21. Albany, NY: Forest Press.

MLA (9th ed.) Citation

Dewey, Melvil. Dewey Decimal Classification and Relative Index. Ed. 21. Forest Press.

Warning: These citations may not always be 100% accurate.