Braverman, Avishay
World Bank, 1989
Buku Teks
Riant Nugroho Dwidjowijoto
Pustaka Pelajar, 2012
Buku Teks
Rianto Nugroho
Pustaka Pelajar, 2012
Buku Teks SO
Renaud, Bertrand
Oxford University Press, 1981
Buku Teks SO
Hossain, Akhtar
Routledge , 1996
Buku Teks SO