Sanguanwongwan, Kanchana
Brooker Group, 1994
Buku Teks
Thailand Development Research Institute, 1995
Buku Teks
edited by P.V. Vidyasagar
Mittal Publications, 2000
Buku Referensi
Cowan, Mary L.
Appleton-Century-Crofts, 1962
Buku Teks
edited by P. V. Vidyasagar
Mittal Publications, 2000
Buku Referensi