Couper, H. (2013). Ensiklopedi ruang angkasa. Kanisius.
Chicago Style CitationCouper, Heather. Ensiklopedi Ruang Angkasa. Kanisius, 2013.
MLA CitationCouper, Heather. Ensiklopedi Ruang Angkasa. Kanisius, 2013.
Warning: These citations may not always be 100% accurate.