B92       Buettner,D.
The world's happiest places what do Denmark, Costa Rica, and Singapore have in common? Their people feel secure, have a sense of purpose, and enjoy lives that minimize stress and maximize joy. Here's how they do it D. Buettner ; photogr. C. Richards // National Geographic. - 2017. - Vol. 232 No. 5. - С. 30-59. - .
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