Michael Terry wrote extensively about his explorations. His later travel journalism is less well-known, but probably was much more widely read, in popular mass-market publications like Walkabout and People. It is this material which includes his secret visitor speculations. I have found the following references thus far, but doubtless there are more. This list will be updated when necessary, and any additional references are most welcome.
Terry’s life is documented in his manuscript autobiography, which was completed by his sister Charlotte after his death [Barnard 1987]. A later historian of Northern Territory exploration discusses some of the problems in filling the gaps in Terry’s life, when he had carefully edited the surviving documentary record [Dewar 2009].
Terry’s personal papers largely relate to correspondence from the 1960s-70s and of letters received. He does annotate the date of his reply on many of them, but almost none of his own responses are preserved [NLA 611-1]. In individual posts relating to particular claims I have tried to verify the presumed sequence of correspondence, including letters that are lost.
Posted by The Secret Visitors Project