Leimena, J.
G.C.T. van dorp & Co, 1956
Buku Teks
Lemkau, Paul V.
McGraw-Hill Book Company, INC, 1955
Buku Teks
editors, Lester Breslow, Jonathan E. Fielding, Lester B. Lave
Annual Reviews, 1990
Buku Teks
Teresita V. Ramos
Southeast Asia Studies center for Asian and Pacific Studies, 1985
Buku Teks
Wilner, Daniel M., author
Macmillan, 1973
Buku Teks