1. “Amateurs on Amazon”;Anonymous;Economist,1999
2. Amazon.com Books (2004), Available at: http://www.amazon.com/exec/obidos/tg/browse/-/283155/ref%3Dtab%5Fb%5Fb%5F3/002-1813048-4623224.
3. “Why Review Books?”;Ree;Journal of Educational and Behavioral Statistics,2003
4. “A New Look at the Library Market”;Edelman;Publishers Weekly,1987
5. Library Acquisition Policies and Procedures;Futas,1977