Gaya APA
Roy,A E, Clarke,D. (2003).
Astronomy:Principles and Practice .
United Kingdom:
IoP.
Gaya Chicago
Roy,A E, Clarke,D.
Astronomy:Principles and Practice.
United Kingdom:
IoP,
2003.
Teks.
Gaya MLA
Roy,A E, Clarke,D.
Astronomy:Principles and Practice.
United Kingdom:
IoP,
2003.
Teks.
Gaya Turabian
Roy,A E, Clarke,D.
Astronomy:Principles and Practice.
United Kingdom:
IoP,
2003.
Teks.