Barker, R. M.
John Wiley & Sons, 1997
Buku Teks
Japan International cooperation agency, 1977
Buku Teks
Zhao, Jim J., author
McGraw-Hill Education, 2017
Buku Teks
Jim J. Zhao, author
McGraw-Hill, 2012
Buku Teks
editor, Akbar R. Tamboli
McGraw-Hill, 1997
Buku Referensi