Ann Arbor University of Michigan, 1969
Buku Teks
Marzuki, author
BPFE - UII, 1989
Buku Teks
Jakarta Bank Indonesia 1996,
Buku Teks
Irma Nursubchiana Indah Iskandar, author
2008
UI - Skripsi (Open)
Maafs, Kurt-Jurgen
Alexander Von Humboldt Foundation , 1989
Buku Teks