Arnold, John D.
McGraw-Hill, 1981
Buku Teks
Bursk, Edward Collins
Cambridge, Mass, Harvard University Press
Buku Teks
Bower, Marvin
Massachutts Harvard University Press , 1949
Buku Teks
Jones, Manley Howe
Ill Irwin , 1957
Buku Teks
Haskell Scchell, Erwin
McGraw-Hill Book Company, INC, 1957
Buku Teks