Jenks, Edward
Murray, 1936
Buku Klasik
Jenks, Edward, author
John Murray, 1953
Buku Teks
Geldart, William, 1870-1922, author
Oxford University Press, 1991
Buku Teks
James, Philip S., author
Butterworth, 1959
Buku Teks
Holdsworth, William, Sir, author
Methuen, 1938
Buku Teks