Gaya APA
Wiramihardja, S. (2015).
Tes Observasi Astronomi Persiapan Menghadapi Olimpiade Sains .
Jakarta:
Bikon ES..
Gaya MLA
Wiramihardja, Suhardja.
"Tes Observasi Astronomi Persiapan Menghadapi Olimpiade Sains".
Jakarta:
Bikon ES.,
2015.
Printed Book.