Much like Happy Days, Laverne and Shirley was the subject of several tie-in novels. Since these books are much like officialized fan-fiction (In some cases, BAD officialized fan fiction), short reviews for research and prosperity seem to be in order!
All were written by the psudomatic Con Steffanson, and were published by Warner Books in the US. If you'd like a copy of your own, alibris.com usually has them in stock.
The maintainer of this website is on the lookout for good-quality scans of the front and back cover of these novels, if you're able to provide this, please send an email to The Webmistress and you will be credited!