Ōkawa, R. (1990). The laws of gold: The wisdom of Buddha that inspires the new civilization. Institute for Research in Human Happiness.
Παραπομπή σε μορφή Chicago (17η εκδ.)Ōkawa, Ryūhō. The Laws of Gold: The Wisdom of Buddha That Inspires the New Civilization. Japan: Institute for Research in Human Happiness, 1990.
Παραπομπή σε μορφή MLA (9th εκδ.)Ōkawa, Ryūhō. The Laws of Gold: The Wisdom of Buddha That Inspires the New Civilization. Institute for Research in Human Happiness, 1990.
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