ebrary, Inc, & Stern, A. (2001). Our universe: The thrill of extragalactic exploration as told by leading experts. Cambridge University Press.
Chicago-viite (17. p.)ebrary, Inc, ja Alan Stern. Our Universe: The Thrill of Extragalactic Exploration as Told by Leading Experts. Cambridge UK ; New York, NY: Cambridge University Press, 2001.
MLA-viite (9. p.)ebrary, Inc, ja Alan Stern. Our Universe: The Thrill of Extragalactic Exploration as Told by Leading Experts. Cambridge University Press, 2001.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.