Reese, Trevor R.
F.W. Cheshire, 1964
Buku Teks
edited by Dean Jaensch
Wakefield Press, 1986
Buku Teks
Younger, R. M.
Victoria Hutchinson Group 1982
Buku Teks
Barnard, Marjorie
Angus and Robertson, 1962
Buku Teks
Barnard, Marjorie
Frederick A. Praeger, 1966
Buku Teks