Reviews are readers' evaluation on your manuscript and give others a sneak peak at what your book is like.
Tip #1: Encourage reviews by writing a letter to your readers at the back of your books. Example: Dear Reader, I hope you enjoyed When Dreams are Calling. Loved it, hated it, if you have the time, I'd just enjoy reading about your experience. Here's the link to my Author Page on Amazon. Thank you, Carol Vorvain
Tip #2: Before your book launch, provide ARC (advanced reader copies) to your email subscribers and other possible reviewers found on book clubs, book blogger directories, Amazon Top Reviewers, and ask them to post the reviews on Goodreads and on their website.
Tip #3: Offer your book to librarians for review using the different programs on LibraryThing or Library Journal.