Geiger, J. (2013). The angel effect: We are never alone (First edition.). Weinstein Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGeiger, John. The Angel Effect: We Are Never Alone. First edition. New York, NY: Weinstein Books, 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGeiger, John. The Angel Effect: We Are Never Alone. First edition. Weinstein Books, 2013.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.