Gaya APA
Purwanto, Agus. (2009).
Pengantar Kosmologi .
Surabaya:
ITS Press.
Gaya Chicago
Purwanto, Agus.
Pengantar Kosmologi.
Surabaya:
ITS Press,
2009.
Text.
Gaya MLA
Purwanto, Agus.
Pengantar Kosmologi.
Surabaya:
ITS Press,
2009.
Text.
Gaya Turabian
Purwanto, Agus.
Pengantar Kosmologi.
Surabaya:
ITS Press,
2009.
Print.