Psychology (1st edition)
Rose M. Spielman, Kathryn Dumper, William Jenkins, Arlene Lacombe, Marilyn Lovett, Marion Perlmutter (OpenStax), 2014
CC BY 4.0 Older edition, still CC BY: free to send with attribution. The newer 2e is non-commercial.
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Free psychology books
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Psychology 2e
Rose M. Spielman, William J. Jenkins, Marilyn D. Lovett et al. (OpenStax), 2020
CC BY-NC-SA 4.0 Non-commercial use only: link, do not resend.
Introduction to Psychology: The Full Noba Collection
Noba Project, Diener Education Fund (many module authors), 2026
CC BY-NC-SA 4.0 Non-commercial use only, and Noba's own terms apply: link, do not resend.
Cognitive Psychology and Cognitive Neuroscience
Wikibooks contributors, 2026
CC BY-SA 4.0 Living wiki book: free to send with a link back to Wikibooks.
Introduction to Behavioral Neuroscience
Elizabeth D. Kirby, Melissa J. Glenn, Noah J. Sandstrom, Christina L. Williams et al. (OpenStax), 2024
CC BY-NC-SA 4.0 Non-commercial use only: link, do not resend.
Animal Intelligence: Experimental Studies
Edward L. Thorndike, 1911
Public domain Public domain (Project Gutenberg): free to send.
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