Hollingworth, Peter
Nelson, 1983
Buku Teks SO
Tindale, Norman B.
Jacaranda Press , 1963
Buku Teks SO
Denholm, David
Penguin Books, 1979
Buku Teks SO
Graeme Davison, J.W. McCarty, Ailsa McLeary, editor
Fairfax, Syme & Weldon Associates, 1987
Buku Referensi
edited by D.J. Mulvaney and J. Peter White
Fairfax, Syme & Weldon Associates, 1987
Buku Referensi