Henso, Truman
Binoculars telescopes and telescopic sights; how they work, howto selec them, and how to design and build your own
Greenberg, 1953
Buku Teks SO
Pugh, Philip
Observing the Messier objects with a small telescope : in the footsteps of a great observer
Springer, 2012
eBooks
Aiu Ahra
Sky
Gramedia Pustaka Utama, 2016
Buku Teks
The Yeungnam observer
Hyo-Soo Lee, President, 2009
Majalah, Jurnal, Buletin
Winton, Tim
That eye, the sky
Australian Large Print, 1987
Buku Teks SO