Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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