APA (7th ed.) Citation

National Geographic Television & Royle, D. (2007). 21ος αιώνας: οι νέες εξερευνήσεις. National Geographic, NGS.

Chicago Style (17th ed.) Citation

National Geographic Television and David Royle. 21ος αιώνας: οι νέες εξερευνήσεις. [Washington, D.C. ]: National Geographic, NGS, 2007.

MLA (9th ed.) Citation

National Geographic Television and David Royle. 21ος αιώνας: οι νέες εξερευνήσεις. National Geographic, NGS, 2007.