National Geographic Television & Film, Michael Hoff Productions, National Geographic Channel (Television station : Washington, D.C.), Warner Home Video (Firm), Kirk, V., Anderson, E., . . . Nelson, J. (2009). Ultimate factories collection.
Chicago Style (17th ed.) CitationNational Geographic Television & Film, et al. Ultimate Factories Collection. 2009.
MLA (9th ed.) CitationNational Geographic Television & Film, et al. Ultimate Factories Collection. 2009.
Warning: These citations may not always be 100% accurate.