L.Ron Hubbard. (2007). The way to Happiness: A common sense guide to better living. New Era Publications.
Παραπομπή Chicago StyleL.Ron Hubbard. The Way to Happiness: A Common Sense Guide to Better Living. Denmark: New Era Publications, 2007.
Παραπομπή MLAL.Ron Hubbard. The Way to Happiness: A Common Sense Guide to Better Living. New Era Publications, 2007.
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