This is a much neglected but extremely important study on the use and knowledge of John's writings by the early Christians.
It is available in Kindle, though admittedly it's pricey:
http://www.amazon.com/The-Johannine-Corpus-Early-Church/dp/0199291446/ref=sr_1_1?ie=UTF8&qid=1339557826&sr=8-1&keywords=hill+johannine+corpus
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