What's this business model called in which links are provided to online sellers of a particular thing like Google books provides links to amazon,etc. ?
PS: If possible please also add link(s) where I can read more about this biz model.
Thanks
It's an advertising model; specifically contextual/targeted advertising in the Google Books example you mentioned.
You can read about business models on the web here. The same site also lists some good links on Google here.
Google also provides some excellent information on their key technologies and insight into the technical principles behind their products here.