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 from this version of children of men as a guide of how to format a citation to the actual film talk contribs