edited by Henry Mayer
F.W. Chesire, 1966
Buku Teks SO
edited by Graeme Duncan
Edward Arnold, 1978
Buku Teks SO
Crisp, L.F. (Leslie Finlay)
Longman, 1973
Buku Teks SO
Sawer, Geoffrey, 1910-1996
Melbourne University Press, 1973
Buku Teks SO
Crisp, L.F. (Leslie Finlay)
Longman Chesire, 1965
Buku Teks SO