Below is a small sample of open access non-textbook books in psychology. Others may be found by searching Directory of Open Access Books or Oapen.
A History of the Case Study: Sexology, psychoanalysis, literature (E-book)
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Introduction to Psychology
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Canadian 1st edition from Original 2010 by Charles Stangor
Research Methods in Psychology
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These links open to listings of books dealing with nursing, health or medicine. For help searching more specifically in these sites, please contact me or Ask a Librarian.