The general reference close reason reads as follows:
This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.
Fairly straight foward, however, I've noticed it is being applied inconsistently across the site. The questions Which Doctor Who episodes were written by Steve Cole? and What two TNG episodes does Ashley Judd appear in and does she say she didn't? were closed as General Reference since they are answered on Wikipedia. However, the questions Who was the judge in The Dark Knight Rises? and Is there an older Doctor Who series? are also answered via their respective Wikipedia pages and have not been closed. I flagged the latter two questions in case they were just overlooked, and although the flags were marked helpful, no action was taken on either them.
The above are just a few examples, I'm sure there are more. Is their some reason to keep the latter two questions open while closing the first two? If not the latter two should be closed (or the first two opened, in which case the general reference close reason may need to be refined).
Being inconsistent with closing questions can be a serious problem. Not only will it cause confusion for users, it also aggravate new users whose questions are closed while other nearly identical questions remain open. This problem has been experienced over at Gaming.SE, and normally results in a very sour new user (who sometimes decide the site is not for them).