Indoor gardening books provide handy advice for the beginner gardener. Browsing through them you'll discover interesting plants, tips and ideas that you may not have otherwise found had you been searching for specific information on the Internet. That's the real value I find in books these days -- you discover new things. I'll review a few to make the decision easier for you.
The best selling guide is The Houseplant Expert is a series of two books by Dr. D.G. Hessayon, the predecessor of which has sold over 14 million copies! It comes highly recommended. It's one of the shorter guides but has a nice balance of content and photos. It covers care for popular house plants and has quite a lot of information about 'roomscaping' or indoor landscaping.
If you only get one house plant book (actually two), I'd recommend it be The Houseplant Expoert. It's a best buy for a reason.
The Complete Houseplant Survival Manual (by Barbara Pleasant) is also highly rated. Although it only contains information on 160 indoor plants, its 384 pages provide more detail than the next book (Houseplant Encyclopedia).
Probably the most comprehensive book is DK's The Houseplant Encyclopedia by Ingrid Jantra and Ursula Kruger. It's 384 pages and covers over 1,000 house plants, along with some care advice.
I always love Dorling Kindersley (DK) books for their lovely illustrated guides. House Plants is their reference for indoor plants. It's bigger on images than on textual content (for example there's a graphical plant chooser but only three pages on plant care).
I would suggest having a look at these four books on Amazon to see which one best suits your particular needs.