I have gotten a verbal offer, but the contract is still not forthcoming, how do I ask the company for it?

How do I ask them the status of my employment offer without being seen as pushy or desperate? Verbal offer was made one month ago, but they have not contacted me since.

usa jobs
usa jobs resume
usa hotel jobs
usajobs
usa jobs federal government
usa job in ksa
usa jobs
usa jobs login
usa jobs gov
usajobs.gov
www.usajobs.gov
usajobs.com
usajobs
usajobs.gov official