Crisp, L. F. (Leslie Finlay), author
Yale University Press, 1949
Buku Teks
Byrt
Buku Teks
Jaensch, Dean Harold
[publisher not identified], 1977
Buku Teks
Finn, Paul, author
Oxford University Press, 1987
Buku Referensi
Encel, S., author
Melbourne University Press, 1974
Buku Teks