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
Christy, George A., author
McGraw-Hill, 1960
Buku Teks