Brady, Robert A, author
University of California Press , 1963
Buku Teks
Brown, Alvin
Prentice-Hall, 1947
Buku Teks
Allen, Louis A., author
McGraw-Hill Kogakusha, 1958
Buku Teks
O`Shaughnessy, John, author
George Allen and Unwin, 1974
Buku Teks
Church, Jeffrey, author
McGraw-Hill, 2000
Buku Teks