Davies, Ruth Ann
R. R. Bowker, 1979
Buku Teks
Gupita, Rajat, foreword
Harvard Business School, 1996
Buku Referensi
Libraries Unlimited, 2000
Buku Teks
Erikson, Rolf
[American Library association;, ], 2007
eBooks
Stein, Barbara L.
Neal-Schuman, 1992
Buku Referensi