Mason, John Brown
Stanford University Press, 1946
Buku Teks
Russell, Frank M.
Russell And Russell, 1951
Buku Teks
Rees, D.F.W. van
Librarie Arthur Rouseau, 1928
Buku Klasik
Brown, John Mason
The Viking Press, 1963
Buku Teks
Thomson, David
Kegan Paul, Trench, Trubner, 1945
Buku Teks