Ferriss, A. L. (2010). Approaches to Improving the Quality of Life: How to Enhance the Quality of Life. Springer Netherlands : Imprint: Springer.
Παραπομπή σε μορφή Chicago (17η εκδ.)Ferriss, Abbott L. Approaches to Improving the Quality of Life: How to Enhance the Quality of Life. Dordrecht: Springer Netherlands : Imprint: Springer, 2010.
Παραπομπή σε μορφή MLA (8th εκδ.)Ferriss, Abbott L. Approaches to Improving the Quality of Life: How to Enhance the Quality of Life. Springer Netherlands : Imprint: Springer, 2010.
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