APA (7th ed.) Citation

Mortimer, M. (1998). Learn Dewey decimal classification (21st edition.). DocMatrix.

Chicago Style (17th ed.) Citation

Mortimer, Mary. Learn Dewey Decimal Classification. 21st edition. Canberra: DocMatrix, 1998.

MLA (9th ed.) Citation

Mortimer, Mary. Learn Dewey Decimal Classification. 21st edition. DocMatrix, 1998.

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