edited by C.J. Armstrong
Gower, 1990
Buku Referensi
Graduate School of Library, Information and Media Studies University of Tsukuba, 2002
Majalah, Jurnal, Buletin
Duff, Alistair S.
Routledge, 2000
Buku Teks SO
edited by Sylvia Simmons
Aslib, 1999
Buku Teks SO
Raed, Jane M.
Chandos Publishing, 2003
Buku Teks SO