Grenville, J.A.S.
Routledge, 2005
Buku Teks SO
Brown, Neville
Pan Books, 1970
Buku Teks SO
Spencer, Frank
Pan Books, 1967
Buku Teks SO
Watt, D.C.
Pan Books, 1967
Buku Teks SO
edited by E.M. Kirkpatrick ; assistant editors, C.M. Schwarz ... [and others]
Chambers, 1983
Buku Referensi