Artikel Jurnal
Coote, Helen
Buku Referensi
Payne, Shelia, author
Glorier International, 1999
Buku Referensi
edited by Loriene Roy, Kelly Jensen, Alex Hershey Meyers
[American Management Association, ], 2009
eBooks
Tella, Adeyinka, 1972-, author
Information Science Reference, 2015
Buku Teks