Do I Have Right to be Listed on Employer's Copyright?

Dear Rich, I wrote a book as part of my employment. While others did provide input, no one else actually wrote any of the content. My employer is requiring that they be listed as the second author. They are also requesting that only they are listed on the copyright. As I understand it, this is a work for hire situation, so they of course should be on the copyright. Do I have a leg to stand on in advocating that I should also be on the copyright?  

If you wrote the book as part of your employment duties, the employer owns the copyright as a work made for hire. According to the Copyright Office, the employer should be listed as the owner (copyright claimant) and as the author on the copyright application.