Encyclopedia of banking & finance; Volume 2
edited by, Glenn G. Munn, F.L. Garcia and Charles J. Woelfel
Salem Press, 1993
 Buku Referensi
Encyclopedia of banking & finance; Volume 2
edited by Charles J. Woelfel
Probus & Toppan, 1994
 Buku Referensi
Encyclopedia of banking & finance; Volume 1
edited by Glenn G. Munn, F.L. Garcia and Charles J. Woelfel
Salem Press, 1993
 Buku Referensi
Encyclopedia of banking & finance; Volume 1
edited by Charles J. Woelfel
Probus & Toppan, 1994
 Buku Referensi
The Encyclopedia Americana : volume 3
Americana Corporation, 1977
 Buku Referensi