I don't think this cuts it--primary source material (including physical and linguistic evidence) is basic, though obviously secondary sources are invaluable in interpreting this material and offering pointers to basic evidence.
Also, let's not exaggerate the difficulty here. With practice, this will get easier because you'll develop a knowledge base of where to find materials on-line, which can be searched quickly. Also, as more contributions come in, a veritable arsenal of citations will accumulate, and you'll notice patterns in the citations that will make for easier access later.
As Spinoza says, "All things excellent are as difficult as they are rare."
In my opinion, it should be at the Tyrant's discretion as to whether to accept any citation. Yet, any citation could be accepted with a proper introductory notation.