Exploration of the universe
Buku Teks
Oparin, A.
The universe
Foreign Languages Publishing House, 1960
Buku Teks
Nicolson, Iain
The universe
Horus Editions, 1995
Buku Referensi
Koupelis, Theo
In quest of the universe
Jones & Bartlett learning, 2011
Buku Teks
The universe grasper
Artikel Jurnal