Wikrama Iryans Abidin, author
General Secretariat of the House of Representatives of the Republic of Indonesia and United Nations Development Programme, 2009
Buku Referensi
Rawlins, Karen
MacMillan Press , 1993
Buku Teks
Higgins, James M., author
Random House Business Division, 1982
Buku Teks
Boyd, Claire, author
Wiley Blackwell, 2014
Buku Teks
editor, Owen Hargie
New York , 2006
Buku Referensi