DDC 21 and beyond: the dewey decimal clssiufication prepares for the future Joan S.Michell
 Artikel Jurnal
Dewey, Melvil, author
DDC 21 (Dewey Decimal Classification Edition 21) : Volume 4 Relative Index. Manual
New York : Forest Press, 1996,
 Buku Referensi
Dewey, Melvil, author
DDC 21 (Dewey Decimal Classification Edition 21) : Volume 3 Schedules 600-999
New York : Forest Press, 1996,
 Buku Referensi
Dewey, Melvil, author
DDC 21 (Dewey Decimal Classification Edition 21) : Volume 2 Schedules 000-599
Forest Press, 1996
 Buku Referensi
Sifton, Pat
Workbook for DDC 20 : Dewey Decimal Classification Edition 20
Canadian Library Association, 1989
 Buku Referensi
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