Edis, Taner. Science and Nonbelief. Prometheus Books. 2008, p. 138. ISBN1-59102-561-3 "Skeptics begin by pointing out that many paranormal claims are the result of fraud or hoaxes. Crop circles—elaborate patterns that appear on fields overnight—appear to be of this sort. Many crop circle makers have come forth or have been exposed. We know a great deal about their various techniques. So we do not need to find the perpetrator of every crop circle to figure out that probably they all are human made. Many true believers remain who continue to think there is something paranormal—perhaps alien—about crop circles. But the circles we know all fall within the range of the sort of thing done in hoaxes. Nothing stands out as extraordinary."
"The Natural History of Staffordshire by Robert Plott; Sciotericum Telescopicum or a new Contrivance of adapting a Telescope to a Horizontall Diall, for observing the moment of time by day or night by Will Molineux". Accounts of Books. Philosophical Transactions. 16 (1686–1692): 207–16. 1686. JSTOR101866.
