Aiu Ahra
Sky
Gramedia Pustaka Utama, 2016
 Buku Teks
Clarke, Arthur C.
Voices from the sky: previews of the coming space age / Arthur C. Clarke
Harper and Row, 1965
 Buku Teks
Winton, Tim
That eye, the sky
Australian Large Print, 1987
 Buku Teks SO
Volkov, A.
Earth and sky
Foreign Languages Publishing House, [Date of publication not identified]
 Buku Teks SO
Coomaraswamy, Rama P.
The door in the sky
Princetown University Press, 1997
 Buku Teks SO