this is a very interesting case,here is a link to the book
"UFO Contact From Planet Koldas: A Cosmic Dialogue," by Wendelle Stevens and Carl Van Vlierden.
The story of Edwin White's UFO contact in South Africa that was meticulously researched by Van Vlierden over several years.
The contact began because a human ET graduate student in an alien space academy on the planet Koldas was required to live and support himself for several years on an extra-planetary body and chose Earth as his instructor had years earlier. Earth's variety of life, and its human institutions of money and religion fascinated the ET graduate student. The young human ET student took on work at an electronics assembly plant and befriended Edwin White.
White took the ET to various different churches to study the belief systems, and just before the ET was to be picked up by others from Koldas, he modified a ham radio so that he and White could mantain contact with each other.
Contact continued through the ham radio receiver, which was later confiscated by government agents. At that point, the ETs turned to using direct voice transmissions with White. The contactee was pursued by hordes of visitors with varying intentions, as well as being constantly surveilled. White and his wife sought privacy and quiet even as his closest friends protected them from constant public and government harrassment.
The researcher Van Vlierden talked with all of the witnesses and White's inner circle, who were cautious, non-attention-seeking people who had been involved with the contactee for many years and who themselves were carefully investigating the strange case to satisfy their own curiosity and gain understanding.
Van Vlierden's research led him to information about an extra-terrestrial organization that operated more than three hundred bases on Earth. http://www.ufophotoarchives.org/2052.html
Wendelle C. Stevens ......web site