Krauel, Jacobo, author
Linksbooks, [date of publication not identified]
Buku Referensi
University of Texas Press,
Majalah, Jurnal, Buletin
McGarry, Kevin
Library Association , 1991
Buku Teks
Shera, Jesse H.
Archon Books, 1965
Buku Referensi
Sannwald, William W., author
[American Management Association;, ], 2009
eBooks