Baldwin, David A. (David Allen), author
Libraries Unlimited, 2003
Buku Referensi
Laughlin, Sara, author
American Library association, 2008
eBooks
Henderson, Algo D., author
Unesco Paris, 1970
Buku Referensi
Eble, Kenneth E., author
Jossey-Bass, 1978
Buku Referensi
Curry, David A., author
Addison-Wesley, 1992
Buku Teks