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izlaidumi no Barbara Fredrickson

Cover for Barbara Fredrickson · Kærlighed (Paperback Book) [1. izdevums] [Paperback] (2013)

Kærlighed (2013)

Barbara Fredrickson

Cover for Barbara Fredrickson · Positivity: Groundbreaking Research to Release Your Inner Optimist and Thrive (Paperback Book) (2011)

Positivity: Groundbreaking Resea... (2011)

Barbara Fredrickson

Cover for Barbara Fredrickson · Positivity: Top-notch Research Reveals the 3 to 1 Ratio That Will Change Your Life (Paperback Book) (2009)

Positivity: Top-notch Research R... (2009)

Barbara Fredrickson