Lapine, Phoebe, SIBO made simple 

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McCracken, Sylvie, The SIBO Solution

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Sarma, Shivan, Healing SIBO 

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​more books on www.amazon.de e.g., "interestingly" there is only one original German book on SIBO, by Doris Paas ("Dünndarmfehlbesiedelung").

More scientifically, but still most important, are the books by doctor and scientist 

Dr. Pimentel from Los Angeles, United States.