Ilbert, Courtenay
Oxford University Press , 1947
Buku Teks
Oxford University Press, 1950
Buku Teks
Larson, Laurence M., author
Holt , 1926
Buku Teks
Morton, A.L., author
Victor Gollancz, 1938
Buku Teks
Richards, Denis, author
Longman, Green, 1952
Buku Teks