George, Carl J.
McGraw-Hill, 1974
Buku Teks
Program Pascasarjana Universitas Indonesia, 1994
Majalah, Jurnal, Buletin
editors Shosuke Susuki, Richard J. Borden, Luc Hens
VUB-Press, 1991
Buku Teks
Butzer, Karl W., author
Cambridge University Press, 1982
Buku Teks
Last, John M., 1926-, author
Appleton & Lange, 1998
Buku Teks