There was a lengthy discussion here n b I m not joking when I say lenghty please be careful if attempting to read it all where some editors involved agreed that citing the film as a primary source is acceptable and others did not There is a template Template Cite video that can be used to cite a video available though a URL but obviously you d have to be sure that the URL steers clear of Wikipedia Copyright violations Personally I would suggest not to use the film as a source for this sort of thing because secondary sources are always better if available Also you want to avoid violating WP SYNTH which is done when you present a conclusion that you reached yourself by citing a primary source But if you do decide to cite the film as a source you can use reference 68 from this version of Children of Men as a guide of how to format a citation to the actual film talk contribs