Mulgan, Richard
Oxford University Press, 1989
Buku Teks SO
Morton, Desmond
Samuel Stevens, 1977
Buku Teks SO
edited by Robert Chapman and Keith Sinclair
Pauls Book Arcade for the University of Auckland, 1963
Buku Teks SO
Aitkin, Don
Pitman, 1985
Buku Teks SO
Aitkin, Don
Pitman, 1985
Buku Teks SO