Ferriss, A. L. (2010). Approaches to improving the quality of life: How to enhance the quality of life. Springer.
Chicago-referens (17:e uppl.)Ferriss, Abbott L. Approaches to Improving the Quality of Life: How to Enhance the Quality of Life. Dordrecht: Springer, 2010.
MLA-referens (8:e uppl.)Ferriss, Abbott L. Approaches to Improving the Quality of Life: How to Enhance the Quality of Life. Springer, 2010.
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