Oliver Lerch’s Disappearance (sources)
- "Stories of Strange Disappearances," article in the Honolulu Star-Advertiser, newspaper of Honolulu, Hawaii, USA, Sunday, November 4, 1906. Pgs. 7-8.
- "What Happened to Oliver Lerch?", by Joseph Rosenberger, article in FATE Magazine, September 1950, USA. Pgs. 28-31
- "Charles Ashmore's Trail," page in The Ambrose Bierce Project, edited by Craig A. Warren, website viewed August 10, 2014. Online at: http://www.ambrosebierce.org/ashmore.htm
- Secrets of the Supernatural, by Joe Nickell (with John F. Fischer), 1988 Prometheus Books, Bufalo, New York, USA. ISBN: 0-87975-461-3. Pgs. 71-73. Online at [snippet view]: https://books.google.com/books?id=VjDV8VC6kDoC&q=%22secrets+of+the+supernatural%22+%22which+was+the+real+oliver%22&dq=%22secrets+of+the+supernatural%22+%22which+was+the+real+oliver%22&hl=en&sa=X&ved=0ahUKEwi87_K-vr3OAhXGMGMKHW08DKkQ6AEIHjAA