I'd recommend "Diaper Free Baby" by Christine Gross-Loh based on all of the discussions I've seen on here and on an article that she wrote in Mothering. It seems to be the most practical combined with a variety of approaches--treating part-time pottying as a perfectly valid option. It sounds like she does a great job of covering starting simply, using diapers as back up if you want, different ages, different approaches, different situations (wohm and sahm), etc. It sounds great.
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My next recommendation would be Infant Potty Basics by Laurie Bouke. That's what I read to start and it was great. Very short, with practical suggestions. It was definitely enough to get me going (but I'm was a sahm with only one dd and had a bit of time on my hands). I get the feeling that Gross-Loh's book is longer, but a very easy read and more helpful to people feeling nervous about jumping in with both feet or with more going on in their lives.
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I also read Diaper Free by Ingrid Bauer and although I found it interesting, for me, it was actually a bit counterproductive. It had inspiring stories, and a great summary of the reasons that ec is great, good motivation etc. But to me it was also a bit "woo-woo," with a focus on following your intuition (something I'm not great at) and striving for perfect communication and catches because it's the most respectful of your baby (that is my memory of what I took away from it...I'm sure it's different for everyone). My impression was also that it was more critical/judgemental feeling towards people who don't ec...I doubt that was the author's intention, but again, that's my memory of how I felt while reading it. My memory is that it made me feel a bit like I wasn't doing enough, and got me too focused on it...to the point where I was offering to often and getting a bit obsessive about it (not really obsessive, but just thinking about it more than I needed to be...my experience has been that if I focus on it too much, it doesn't work as well). I also felt like it implied that we should be done by 1.5 years, which I don't think is a realistic or fair expectation to set for yourself. It's certainly not unusual, but doesn't happen for everyone, so you shouldn't be critical if it doesn't!
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Anyway, I always recommend Gross-Loh's book first and try to steer newcomers away from Bauer's book because I feel like the first makes it sound really do-able to newbies and Bauer's makes it sound like an all or nothing overwhelming thing.
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Good luck and enjoy!