John R. Canada, author
Pearson/Prentice Hall, 2004
Buku Teks
Au, Tung, 1923-, author
Prentice-Hall, 1992
Buku Teks
North Sulawesi Regional Investment Coordinating Board, 1993
Buku Teks
Indonesia National Development Information Office, 1996
Buku Teks
BKPM, 1991
Buku Teks