Chopra, D. (2008). Why is God laughing?: The path to joy and spiritual optimism. Harmony Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रChopra, Deepak. Why Is God Laughing?: The Path to Joy and Spiritual Optimism. New York: Harmony Books, 2008.
एमएलए (8वां संस्करण) प्रशस्ति पत्रChopra, Deepak. Why Is God Laughing?: The Path to Joy and Spiritual Optimism. Harmony Books, 2008.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.