When to cite the whole book:
When the entire book has been written by the same set of authors, and the chapters have not been contributed by different authors, then you regard the entire book as a single source and cite the whole book. If you use three different chapters from the same book, it still only counts as one source - only one book.
Oshima, A., & Hogue, A. (2007). Introduction to academic writing. Pearson/Longman.
When to cite the individual chapters:
If the book has been edited or compiled, and each chapter has its own authors, then you cite each chapter separately. If you use three different chapters, each chapter counts as a separate source.
Martin, A. (2006). Literacies for the digital age. In A. Martin & D. Madigan (Eds.), Digital literacies for learning (pp. 3-25). Facet.
Information needed for a book
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Information needed for a chapter of an edited book
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