Bloomsbury, 1990
Buku Referensi
edited by Angela Partington
Oxford University Press, 1993
Buku Referensi
Eigen, Lewis D.
Macmillan, 1993
Buku Referensi
Cohen, John Michael, 1903-1989
Penguin Books, 1971
Buku Referensi
Cohen, John Michael, 1903-1989
Allen Lane, 1980
Buku Referensi