| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| March 1935 |
|
Secret Agent X, March 1935 | Periodical House | MAGAZINE | |
| 1980 |
|
Secret Agent-X: A History | Robert Weinberg | Nonfiction | 93 |
| 1990 | Secret Agent-X | Golden Perils Press & Fading Shadows | Nonfiction |