Cambridge University Press, 2020
eBooks
ISEAS, 1997
Buku Teks SO
editor, Joseph M. Putti
McGraw-Hill, 1991
Buku Teks SO
Root, Hilton L
Asian Development Bank by Oxford University Press, 1996
Buku Teks SO
Soriane, Emmanuel V.
Sintag-Tala, 1987
Buku Teks