Chapman, Robert D.
Discovering astronomy
W.H. Freeman, 1978
 Buku Teks SO
Jefferys, William H.
Discovering astronomy
John Wiley & Sons, 1981
 Buku Teks SO
Hutton, Wendy
Discovering Sabah
Opus Publications Sdn Bhd, 2007
 Buku Referensi
Yohana Nessy Christiana
Discovering myselft
PT Gramedia, 2022
 Buku Teks SO
Kularatna, Nihal
Electronic circuit design : from concept to implementation
CRC Press, Taylor & Francis Group, 2008
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