Encel, S.
Melbourne University Press, 1974
Buku Teks
Jennings, Ivor, Sir, 1903-1965
Cambridge University Pers, 1951
Buku Teks
Crisp, L.F. (Leslie Finlay)
Yale University Press, 1949
Buku Teks
Byrt
Buku Teks
Jaensch, Dean Harold
[publisher not identified], 1977
Buku Teks