Hefferon, K., & Boniwell, I. (2011). Positive psychology: Theory, research and applications. Open University Press/McGraw-Hill.
Citace podle Chicago (17th ed.)Hefferon, Kate, a Ilona Boniwell. Positive Psychology: Theory, Research and Applications. Maidenhead, Berkshire ; New York: Open University Press/McGraw-Hill, 2011.
Citace podle MLA (9th ed.)Hefferon, Kate, a Ilona Boniwell. Positive Psychology: Theory, Research and Applications. Open University Press/McGraw-Hill, 2011.
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