Mortimer, M. (1997). Learn Dewey Decimal Classification (Edition 21). DocMatrix Pty Ltd.
Cita Chicago (17th ed.)Mortimer, Mary. Learn Dewey Decimal Classification (Edition 21). Canberra: DocMatrix Pty Ltd, 1997.
Cita MLA (9th ed.)Mortimer, Mary. Learn Dewey Decimal Classification (Edition 21). DocMatrix Pty Ltd, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.