Isaacs, Asher, 1902-1963, author
Van Nostrand , 1964
Buku Teks
Butler, Henry N., author
South-Western Publishing, 1987
Buku Teks
Watson, Donald Stevenson, author
Houghton Miffiln, 1960
Buku Teks
Manley, John F., author
Macmillan, 1976
Buku Teks
Cranston, Ross, author
Oxford University Press, 1987
Buku Teks