APA (7th ed.) Citation

Panek, R. (2011). The 4 percent universe: Dark matter, dark energy, and the race to discover the rest of reality. Houghton Mifflin Harcourt.

Chicago Style (17th ed.) Citation

Panek, Richard. The 4 Percent Universe: Dark Matter, Dark Energy, and the Race to Discover the Rest of Reality. Boston: Houghton Mifflin Harcourt, 2011.

MLA (8th ed.) Citation

Panek, Richard. The 4 Percent Universe: Dark Matter, Dark Energy, and the Race to Discover the Rest of Reality. Houghton Mifflin Harcourt, 2011.

Warning: These citations may not always be 100% accurate.