APA (7 ম সংস্করণ) উদ্ধৃতি

Sagan, C. (2001). As ligações cósmicas. Gradiva.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Sagan, Carl. As Ligações Cósmicas. Gradiva, 2001.

M.L.A (8 ম সংস্করণ) উদ্ধৃতি

Sagan, Carl. As Ligações Cósmicas. Gradiva, 2001.