Gaya APA
UK), I, M, (, O, M. (2008).
Introduction to Astronomy and Cosmology .
Amerika:
Wiley (John Wiley & Sons, Ltd.).
Gaya MLA
UK), Ian, Morison, (University, Of, Manchester;.
"Introduction to Astronomy and Cosmology".
Amerika:
Wiley (John Wiley & Sons, Ltd.),
2008.
Text.