I read "Stress-Free Potty Training" by Sara Au and Peter L. Stavinoha, Ph.D. over the weekend. The cover says "Match the toilet training to your child's unique personality and temperament!" and it also says "A Commonsense guide to finding the right approach for your child".
Since we've been potty training for several months already I wasn't even sure if it would be worthwhile to read this book, but I skimmed it anyway. It would be great for a beginner though.
There is a 5-part quiz that you take to determine which personality type your child has. My child scored high in 3 of the 5 parts, and that was kind of discouraging. However, following the quiz is a summary of the 5 personalities and I was able to determine from those descriptions which one fit my child best. I read some of the "universal" information about remaining calm about accidents and "nakedtime" etc. Some of the suggested dialog was pretty silly. I don't think a 2 year old is on the level that these authors are expecting in terms of language skills. One helpful thing was a chart that listed several different potty-related skills/achievements and the average age girls and boys reach them (different for each gender). My little girl is more advanced than I thought she was. Since we have been potty training for so long I skipped most of the personality chapters and just read the one that pertained to my kid... strong willed child. If we were just starting out, this probably would be helpful, but since we aren't, the information just fell into the "commonsense" category. It was a reassuring book to read though. It let me know that we are doing things the way they should be done, and my goals have been realistic.
If you have already started potty-training then you could read this book in your local library or bookstore. If you are just beginning or haven't begun yet, it would probably be worth buying.