edited by Gordon Greenwood
Angus and Robertson, 1969
Buku Teks
Younger, R. M.
Victoria Hutchinson Group 1982
Buku Teks
Ward, Russel, author
Prentice-Hall, 1965
Buku Teks
edited by Gordon Greenwood
Angus & Robertson, 1978
Buku Teks
Crawford, R. M.
Hutchinson University Library, 1963
Buku Teks