Sources:

• Among the Missing, by Jay Robert Nash, 1978 Simon and Schuster, pg. 330.
• Charles Berlitz's World of the Incredible but True, by Charles Berlitz, 1991 Fawcett Crest Books, pg. 222-223.
• FATE Magazine, Clark Publishing Company.
  1953, July (#40) - "How Lost Was My Father?", by Stuart Palmer, pg. 75-85, 3 illus.
  1956, Dec. (#81) - Excerpt from the book "Mind Over Space", by Nandor Fodor, pg. 84-95, which includes the same section as referenced in the full book below.
  1977, Dec. (#333) - "David Lang Vanishes... FOREVER", by Robert Schadewald, pg. 54-60, 3 photos.
• Fortean Times #18 (October 1976), "Fortean Corrigenda: The Disappearance of David Lang", pg. 6-7.
• Into The Unknown, by Reader's Digest, 1981 Reader's Digest Association, Inc. pg. 341.
• Into Thin Air, by Paul Begg, 1979 A.H. & A.W. Reed PTY LTD, pg.33-38.
• Mind Over Space, by Nandor Fodor, 1962 The Citadel Press, pg. 78-80.
• Mysteries of the Unexplained, by Reader's Digest, 1982 Reader's Digest Association, Inc., pg. 121.
• Paradox, by Nicholas R. Nelson, 1980 Nicholas R. Nelson, pg. 14,21-23,64-65.
• People's Almanac, by David Wallechinsky and Irving Wallace, Doubleday 1975, pg. 1370-1371.
• Secrets of the Supernatural, by Joe Nickell, 1988 Prometheus Books, pg. 65-70.
• Strange Mysteries of Time and Space, by Harold T. Wilkins, copyright 1958 Harold T. Wilkins, The Citadel Press, pg.180-182.
• Stranger Than Science, by Frank Edwards, 1959 Lyle Stuart, Inc., pg. 5-7.
• Supernatural Disappearances, by Rodney Davies, 1995 Robert Hale Ltd., pg. 136-137.
• Time and Space (Mysteries of the Unknown Series), by Time-Life Books, 1990 Time-Life Books, pg. 131-132.
• Unexplained!, by Jerome Clark, 1993 Visible Ink Press, pg. 91,92.

My Sources' Sources (I would like to find copies of these):

• "Ghost", a magazine supposedly published in the US between 1936 and 1937, which may contain an earlier version of Stuart Palmer's "How Lost Was My Father?" story that ran in the July 1953 FATE Magazine. Palmer claimed that his story of the Lang disappearance had been published in this magazine when he submitted the story to FATE, and it was partly this apparent previous publication that helped convince the FATE editors to run the story. It is possible that, like the handwritten evidence submitted by Palmer, this claimed previous publication is false.
• Mysterious Disappearances of Men and Women in the U.S.A., Britain, and Europe, by Harold T. Wilkins, Haldeman-Julius Publications, 1948.