Centre for research of human resources and the nvironment University of Indonesia, 1991
Buku Referensi
Higgitt, David, editor
Springer, 2012
eBooks
The World Bank, [date of publication not identified]
Buku Teks
White, Rodney R., author
John Wiley & Sons, 1994
Buku Teks
Leitmann, Josef, author
McGraw-Hill, 1999
Buku Teks