Pranoto, author
Gatotkaca : the knight of the sky
T.p, T.th
 Buku Referensi
Sky climbers workbook
by Ira E. Aaron ... [and others]
Scott, Foresman and Company, 1983
 Buku Teks
Shaffer, Rick, author
Your guide to the sky
Lowell House, 1999
 Buku Referensi
Gamow, George
Matter, earth, and sky / George Gamow
Prentice-Hall, 1963
 Buku Teks
Jeju Islan: an Island of sky and sea
Jeju Tourism Organization, 2011
 Buku Teks
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