Websites
1. http://www-rohan.sdsu.edu/
2. http://www.entrepreneur.com/article/80786
3. http://womeninbusiness.about.com/
Books
1. Commonsense Direct & Digital Marketing Paperback – 2 Nov 2012 by Drayton Bird (Author)
2. Direct Marketing: Strategy, Planning, Execution Hardcover – January 21, 2000 by Edward Nash (Author)