Campbell, W. K. H., author
W. Heffer & Sons , 1951
Buku Teks
by H.B. Chenery ... [et al.]
Universitaire Pers Rotterdam, 1967
Buku Teks
Wadsworth, John S., author
Morgan Stanley Asia, 1997
Buku Teks
Bangkok United Nations 1987,
Buku Teks
Tung, Ta-Lin, author
Foreign Languages Press, 1959
Buku Teks