edited by Henderikus J. Stam
Sage Publications, 1998
Buku Teks
Carlson, Neil R., author
Pearson-Prentice Hall, 2005
Buku Teks
Davison, Gerald C.
John Wiley & Sons, 1998
Buku Teks
Carlson, Neil R., author
Pearson Education, Inc., 2002
Buku Teks
Harlow Longman , 1995
Buku Teks