Sources

1.
Pick Pocket Guide, Version IV, Jonathan E. Sisk, 1988, p 54 section III
2.
"Crystal sets", Personal Computer News, Vol. 1, No. 27, September 8 1983, p. 4
3.
"Take your Pick", Personal Computer World, August 1986, p. 166-169
4.
"Pick an agent", Personal Computer World, December 1984, p. 102
5.
"Pick 'n' choose", Personal Computer World, April 1983, p. 108

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