Guinto, Ricardo S., Abalos, Rodolfo M., Cellona, Roland V., Fajardo, Tranquilino T.
Sasakawa Memorial Health Foundation, 1983
Buku Referensi
University of Technology Sydney
Lovell Johns , 1996
Buku Referensi
Rachmat Bratamidjaja, Sutjipto, advisory editors; Ensiklopedi Indonesia
Ichtiar Baru Van Hoeve, 1990
Buku Referensi
Mitchell, David A., author
Sceptre , 2003
Buku Teks
Rand McNally, editor
Time-Life Books, 1968
Buku Referensi