Oxley, Harold
Gunung Mulia, 1993
Buku Teks
Buku Teks
Pinet, Paul R.
Jones and Bartlett Publishers, 1998
Buku Teks
Robert, Paul
Dictionnaires le Robert, 1993
Buku Referensi
Streeten, Paul P., author
Boston Institute for Economic Development, Boston University 1989,
Buku Teks