Milner, Frederic
Macmillan, 1931
Buku Teks
Extavour, Winston Concrad
Sijthoff, 1981
Buku Teks
Eckhardt, Robert B., author
McGraw-Hill, 1979
Buku Teks
Smith, David R.
Van Nostrand Reinhold, 1993
Buku Teks
Kuebler, Roy R., author
John Wiley & Sons, 1976
Buku Teks