edited by Thomas M. Paikeday
Holt, Rinehart and Winston, 1976
Buku Referensi
Clarendon Press, 1994
Buku Referensi
Wely, F Prick van, author
London, Cassell
Buku Referensi
Oxford University Press, 1971
Buku Referensi
Schoffler, Herbert, author
Harrap, 1979
Buku Referensi