Adams, Laurie Schneider, author
Brown & Benchmark , 1997
Buku Referensi
Grattan, C. Hartley, author
The University of Michigan Press, 1963
Buku Teks
Freeland, John Maxwell, 1920-, author
F.W. Cheshire, 1968
Buku Teks
Scott, Ernest
Oxford University Press, 1953
Buku Teks
edited by Gordon Greenwood
Angus and Robertson, 1955
Buku Teks