Discovery Channel (Firm). (2003). Philadelphia (2nd ed., updated.). APA Publications.
Chicago Style (17th ed.) CitationDiscovery Channel (Firm). Philadelphia. 2nd ed., updated. Singapore: APA Publications, 2003.
MLA (9th ed.) CitationDiscovery Channel (Firm). Philadelphia. 2nd ed., updated. APA Publications, 2003.
Warning: These citations may not always be 100% accurate.