Collier, J.A.B
Oxford University Press, 1995
Buku Teks SO
R.A. Hope, J.M. Longmore, T.J. Hodgetts, P.S. Ramrakha
Oxford University Press, 1993
Buku Teks SO
R.A. Hope, J.M. Longmore, T.J. Hodgetts, P.S. Ramrakha
Oxford University Press, 1993
Buku Teks SO
Spickett, Gavin
Oxford University Press, 1999
Buku Referensi
Murray Longmore [and others]
Oxford University press, 2014
Buku Teks