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Atkinson And Hilgard's Introduction To Psychology
av Edward Smith, Susan Nolen-Hoeksema, Barbara Fredrickson m.fl. (2003)
Atkinson & Hilgard's Introduction to Psychology
av Susan Nolen-Hoeksema, Barbara L. Fredrickson, Geoff R. Loftus (2009)
Love 2.0 : creating happiness and health in moments of connection
av Barbara Fredrickson (2014)
Positivity grounbreaking research to release your inner optimist and thrive
av Barbara Fredrickson (2011)