Gaya APA
Oswalt, T, D., Keel, W, C. (2013).
Planets, stars and stellar systems ; Volume 6: Extragalactic astronomy and cosmology .
Dordrecht, Netherland:
Springer Dordrecht.
Gaya MLA
Oswalt, Terry, D.., Keel, William, C..
"Planets, stars and stellar systems ; Volume 6: Extragalactic astronomy and cosmology".
Dordrecht, Netherland:
Springer Dordrecht,
2013.
Electronic Resource.