Wang, Solon
The multiple planes of the cosmos and life : the survival theory of ancient sages as proved by modern psychicists
Society for Psychic Studies R.O.C., 1997
 Buku Teks
Marion, Jerry B.
Physics and the physical universe
John Wiley & Sons, 1980
 Buku Teks
Clark, Adrian V.
Cosmic mysteries of the Universe
Parker Publishing, 1968
 Buku Teks SO
Murdin, Paul
Secrets of the universe: how we discovered the cosmos
Thames &​ Hudson, 2009
 Buku Referensi
Ferguson, Kitty
Measuring the universe : our historic quest to chart the horizons of space and time
Walker, 1999
 Buku Teks