Gaya APA
International Olympiad on Astronomy and Astrophysics Problems Volume II 2013-2014. (2016).
Nusa Tenggara Timur:
PT. Trisula Adisakti.
Gaya MLA
International Olympiad on Astronomy and Astrophysics Problems Volume II 2013-2014.
-.
Nusa Tenggara Timur:
PT. Trisula Adisakti,
2016.
Text.