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