Creel, George, 1876-1953, author
Bobbs-Merrill, 1949
Buku Teks
Acton, Edward
Longman, 1986
Buku Teks
Deutscher, Isaac
Oxford University Press, 1967
Buku Teks
Fennell, John
Longman, 1983
Buku Teks
Mitchell, Mairin, author
Sidwick and Jackson, 1949
Buku Teks