Theraja, B.L.
Chand, 1997
Buku Teks
Pethebridge, Keith
McGraw-Hill, 2012
Buku Teks
Theraja, B.L.
S. Chand & Company, 1996
Buku Teks
Thompson, F.G.
Longmans, Green and Co, Ltd., 1968
Buku Teks
Thompson, F.G.
Longman Scientific and Technical, 1992
Buku Teks