Jeju Islan: an Island of sky and sea
Jeju Tourism Organization, 2011
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Chichester, Francis Sir
The lonely sea and the sky / Sir Francis Chichester
Ballantine Books, 1964
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From sky to sea: environmental and development in Sulawesi
Departhemen of Geography University of Waterloo, 2005
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Aiu Ahra
Sky
Gramedia Pustaka Utama, 2016
 Buku Teks
Aiu Ahra
Sky
Gramedia Pustaka Utama, 2016
 Buku Teks