Watson, Richard T., author
John Wiley & Sons, 2002
Buku Teks
March, James G., author
Wiley, 1950
Buku Teks
Orduna-Malea, Enrique, author
Chandos Publishing, 2018
Buku Teks
Greenberg, Jerald, author
Pearson, Prentice Hall, 2008
Buku Teks
edited by James L. Gibson
Tex Business Publications , 1982
Buku Teks