| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| December 1936 |
|
Secret Agent X, December 1936 | Periodical House | MAGAZINE | |
| 1980 |
|
Secret Agent-X: A History | Robert Weinberg | Nonfiction | 19 |
| 1990 | Secret Agent-X | Golden Perils Press & Fading Shadows | Nonfiction | ||
| 2007 |
|
The Blood 'N' Thunder Guide to Collecting Pulps | Murania Press | Nonfiction | 92 |