Harrod, Leonard Montague
England : Gower Pub, 1987,
Buku Referensi
Powell, Ronald R.
Libraries Unlimited, Inc., 2004
Buku Teks SO
Simpson, I.S.
Library Association, 1988
Buku Teks SO
edited by David Stern
Routledge, 2009
Buku Teks SO
Ranganathan, S.R.
Sarada Ranganathan Endowment for Library Science, 1992
Buku Referensi