Gaya APA

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International Olympiad on Astronomy and Astrophhysics Problems Volume 1 2007-2012. (2016). Nusa Tenggara Timur: PT. Trisula Adisakti.

Gaya MLA

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International Olympiad on Astronomy and Astrophhysics Problems Volume 1 2007-2012. -. Nusa Tenggara Timur: PT. Trisula Adisakti, 2016. Text.