by Willis H. Johnson...[et al.]
Holt, Rinehart and Winston, 1974
Buku Teks
Fairley, James L.
Van Nostrand , 1966
Buku Teks
Anderson, Arthur K.
John Wiley & Sons, 1953
Buku Teks
Shillady, Donald
Taylor and Francis, 2012
Multimedia
Bahl, B.S.
Buku Teks