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
Aiu Ahra
Sky
Gramedia Pustaka Utama, 2016
Buku Teks
Aiu Ahra
Sky
Gramedia Pustaka Utama, 2016
Buku Teks
Pugh, Philip
Observing the Messier objects with a small telescope : in the footsteps of a great observer
Springer, 2012
eBooks
The Yeungnam observer
Hyo-Soo Lee, President, 2009
Majalah, Jurnal, Buletin