Gaya APA

Britannic, Encyclopedia Britannica, Macropedia, Propedia and the thistle are registered trademarks of Encyclopedia Britannica. (2010). USA: International Standard Book.

Gaya MLA

Britannic, Encyclopedia Britannica, Macropedia, Propedia and the thistle are registered trademarks of Encyclopedia Britannica. 15. USA: International Standard Book, 2010. Text.