Printer Publishers , 1988
Buku Teks
Manurung, Priscilla R.
Universitas Indonesia, 2012
UI - Skripsi (Open)
Benny Teh Cheng Guan
Springer, 2012
eBooks
Ivancevich, John M.
McGraw-Hill , 2002
Buku Teks
Tan, Chwee Huat, editor
Pearson Prentice Hall, 2004
Buku Teks