Baker, Hugh D. R., author
Teach Yourself , 2015
Buku Teks
Bruce, R. Robert, author
Hodder & Stoughton, 1994
Buku Teks
Tong, Keith S. T., author
Routledge, 1994
Buku Teks
Tong, Keith S. T., author
Routledge, 1995
Buku Teks
Cowles, Roy T., author
South China Peniel Press, 1949
Buku Referensi