APA (7 ম সংস্করণ) উদ্ধৃতি

Cass, S. Free as in freedom: Richard Stallman's crusade for free software [Book Review]. IEEE spectrum.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Cass, S. "Free as in Freedom: Richard Stallman's Crusade for Free Software [Book Review]." IEEE Spectrum .

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

Cass, S. "Free as in Freedom: Richard Stallman's Crusade for Free Software [Book Review]." IEEE Spectrum, .