Toynbee, Arnold J., translator
Osford University Press, 1969
Buku Teks
editors, Hans G. Schuetze, German Alvarez Mendiola
Sense, 2012
eBooks
Luning, H.A.
SoutheEast Asian Regional Center for Graduate Study and Research in Agriculture , 1891
Buku Teks
IMF Institute and Monetary and Exchange Affairs Departement, International Monetary Fund , 1997
Buku Teks
Bruns, Ramon O., author
Burgess Publishing Company, 1974
Buku Teks