Fields, Edward
American Management Association, 2002
eBooks
Sherman, Eliot H.
American Management Association, 2011
eBooks
Vause, R.
Macmillan, 1975
Buku Teks
Baker, Judith J.
Jones & Bartlet Learning, 2014
Buku Teks
Livingstone, John Leslie
Binarupa Aksara, 1994
Buku Teks SO