Lesikar, Raymond V. (Raymond Vincent), author
R.D. Irwin, 1965
Koleksi Publik
Nestle Foundation
Nestle Foundation, 2004
Buku Teks
Manzer, Ronald A., author
McGraw-Hill , 1974
Buku Teks
Commonwealth of Australia , 1985
Buku Teks
prepared by Narongchai Akrasanee [and others]
Centre for Strategic and International Studies, 1981
Buku Teks