Several professionals, experts and academics, mostly from our team, have been involved in the process of creating Habinator.
If there is a claim or phrase with a number like  it means that the reference can be found in the Research and books page. The number references a study or several studies. We don't usually list individual studies (if they are not very reliable and found to be common knowledge) and we prefer to use meta analysis.* If the science fact is from a book, the study is listed on the Research and books page. In general, books are used in a broader sense and not as a single scientific fact.
Almost all books that are based on science (they include references to studies), shortly put: Researchers are not marketing professionals. Promoting is not their job. :) That is why other people write books about it and describe the research a way "normal people" can actually understand the results. It's also not exactly the researchers job to put the results into implementation which we are doing in Habinator. Some of the books were even written by people without any education and/or people who lived during times where no research knowledge was publicly available. Still they figured out how people succeed, make friends, motivate people, stay healthy, thrive, and quit addictions and it's no way less significant than scientific proof of it - on the contrary!
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* Every new, current, or old (scientific paradigms, facts and methods do change!) scientific method or fact may or may NOT work for your benefit! Studies reflect how most people behave.