APA
National Geographic Channel, . (2008). What would happen if... Part-1. : Ocian media.
Chicago
National Geographic Channel, . 2008. What would happen if... Part-1. : Ocian media.
Harvard
National Geographic Channel, . (2008). What would happen if... Part-1. : Ocian media.
MLA
National Geographic Channel, . What would happen if... Part-1. : Ocian media. 2008.