Trefil, J. (1988). The dark side of the universe: A scientist explores the mysteries of the cosmos. Charles Scribner's Sons.
Lua i Stíl Chicago (17ú heag.)Trefil, James. The Dark Side of the Universe: A Scientist Explores the Mysteries of the Cosmos. New York: Charles Scribner's Sons, 1988.
Lua MLA (9ú heag.)Trefil, James. The Dark Side of the Universe: A Scientist Explores the Mysteries of the Cosmos. Charles Scribner's Sons, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.