Artikel Jurnal
edited by Karen Ellis
Information Science Reference, 2012
Buku Teks
Stephenson, Mary Sue
The Scarecrow Press, 1990
Buku Referensi
Tomaiuolo, Nicholas G., author
Information Today, 2004
Buku Teks
Cunha, George Daniel Martin, author
Scarecrow Press, 1971
Buku Referensi