Immigration and Big Business

I’m doing a paper on immigration reform and how it has been influenced by the corporate sector. While their is a bunch of info in journals and newspaper articles, I’m lacking in book references.

I have found nothing definitive in any of the books I’ve located on the subject, has anyone read anything relating to the topic that could help point me in the right direction?

I’m not arguing for or against, either side would be beneficial to me. Thanks for any help you guys could offer on this.