Panek, R. (2011). The 4 percent universe: Dark matter, dark energy, and the race to discover the rest of reality. Houghton Mifflin Harcourt.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPanek, Richard. The 4 Percent Universe: Dark Matter, Dark Energy, and the Race to Discover the Rest of Reality. Boston: Houghton Mifflin Harcourt, 2011.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPanek, Richard. The 4 Percent Universe: Dark Matter, Dark Energy, and the Race to Discover the Rest of Reality. Houghton Mifflin Harcourt, 2011.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.