Gaya APA
Sobel, D. (2011).
A more perfect heaven: How Copernicus revolutionized the cosmos. .
New York:
New York Walker & Company.
Gaya MLA
Sobel, Dava.
"A more perfect heaven: How Copernicus revolutionized the cosmos. ".
New York:
New York Walker & Company,
2011.
Buku.