edited by Wai-Fah Chen, Lian Duan
CRC Press, 1999
Buku Referensi
Victor, D. Johnson, author
Oxford and IBH, 1980
Buku Teks
Japan International cooperation agency, 1977
Buku Teks
Bindra, S.P.
Dhanpat Rai & Sons, 1982
Buku Teks
edited by Kjell B. Zandin
McGraw-Hill, 2001
Buku Referensi