Jones, Charles P., author
John Wiley & Sons, 1999
Buku Teks
Alexander, Gordon J., author
Prentice-Hall, 2000
Buku Teks
Cooper, Robert U., author
Macmillan, 1953
Buku Teks
Cooper, Robert U., author
Macmillan, 1952
Buku Teks
Grodinsky, Julius
Ronald Press , 1953
Buku Teks