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| Author | Title | Year | |
|---|---|---|---|
| 1. | [Results of survey of perfins on Canadian pre-admiral issues] | 1983 | |
| 2. | [List of issues of types of perfins] | 1986 | |
| 3. | J4 finally identified [JEP/SON - Lowell E. Jepson] | 1987 | |
| 4. | International Harvest Co. [list of issues reported] | 1987 | |
| 5. | CNR perfins / CPR perfins | 1988 | |
| 6. | Centennial definitives survey [perfins] | 1989 | |
| 7. | Behm, Michael | The Mutual Life perforator | 1988 |
| 8. | Fennell, Mark | Speculations [US design 16 found on MR 4 with Metoa, Saskatchewan postmark] | 1989 |
| 9. | Benningen, Jack | Perfin design type T.5 - TP & T | 1978 |
| 10. | Benningen, Jack | B.10, B10a and sub. varieties - Bell Telephone Co. | 1985 |