Jockson, Gerald
Nias Press, 2009
Buku Teks
Belcher, Wendy Laura
Sage Publications, 2009
Buku Teks
Belcher, Wendy Laura
Sage Publications, 2009
Buku Teks
Brown, Paul B.
[American Management Association, ], 2004
eBooks
Mulholland, Harry
Mulholland-Wirral, 1984
Buku Referensi