1. Book with one author:
Author, A. A. (Year). *Title of work*. Publisher.
Example:
Smith, J. (2023). *The history of cheese*. Penguin Random House.
2. Book with two authors:
Author, A. A., & Author, B. B. (Year). *Title of work*. Publisher.
Example:
Jones, M., & Brown, P. (2022). *Exploring the cosmos*. Oxford University Press.
3. Book with three or more authors:
Author, A. A., Author, B. B., & Author, C. C. (Year). *Title of work*. Publisher. *(List all authors up to 20; after 20, use et al.)*
Example:
Garcia, R., Rodriguez, L., Martinez, S., & Hernandez, A. (2021). *Advanced statistical analysis*. Springer.
4. Edited book:
Editor, A. A. (Ed.). (Year). *Title of work*. Publisher.
Example:
Miller, K. (Ed.). (2020). *The future of technology*. Cambridge University Press.
5. Chapter in an edited book:
Author, A. A. (Year). Title of chapter. In A. A. Editor & B. B. Editor (Eds.), *Title of book* (pp. pages). Publisher.
Example:
Wilson, E. O. (2018). Biodiversity. In R. Dawkins & M. Ridley (Eds.), *Evolutionary biology today* (pp. 120-145). Oxford University Press.
Important Notes:
* Italics: Book titles are italicized.
* Capitalization: Only the first word of the title and subtitle (if any), and proper nouns, are capitalized in the book title. Capitalize all major words in the chapter title.
* Page Numbers: For chapters in edited books, include page ranges.
* Retrieval Information: For online books, you might need to include a DOI or URL. Always check the current APA style guide for the most up-to-date instructions.
Remember to always consult the official Publication Manual of the American Psychological Association for the most accurate and current guidelines.