Batley, Sue,a uthor
Chandos Publishing, 2007
Buku Teks
Bohl, Marilyn
Science Research Associates, 1971
Buku Teks
Freeman, Lee A
Information Science, 2005
Buku Teks
Freeman, Lee A.
Information Science, 2005
Buku Teks
Nanking (China) : The Council of International Affairs
Majalah, Jurnal, Buletin