T. Kanti Srikantaiah, Michael E.D. Koenig, editor
Information Today, 2000
Buku Teks
Delong, Thomas, author
McGraw-Hill Irwin, 2003
Buku Teks
Hansen, Helen F.
W.B. Saunders Company, 1947
Buku Teks
Barclay, Tessa
Headline, 1991
Buku Teks
Wakita, Osamu A., author
John Wiley & Sons, 1977
Buku Teks