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| Author | Title | Year | |
|---|---|---|---|
| 1. | Allen, J. Miller | The 7 1/2 d. re-entered imprint | 1956 |
| 2. | Arfken, George B. and Charles G. Firby | The 7 1/2d rate to Britain & the responses of the colonial post offices | 2006 |
| 3. | Brown, F.L.R. | The die differences, 1857-7 1/2 d. and 1859-12 1/2 c. | 1952 |
| 4. | Des Rivières, Guy | The remarkable story of the famous stamp twins 'PEM & BINA' | 1953 |
| 5. | Des Rivières, Guy | The Pem...BINA twins | 1954 |
| 6. | Fairbanks, A. Graham | The Canada 7 1/2 pence | 1957 |
| 7. | Hamilton, Patrick | Seven pence-half penny centenary | 1957 |
| 8. | Jarrett, Fred | Important new variety in 7 1/2 d. green | 1954 |
| 9. | Stamp twins re-united in Montreal | 1956 | |
| 10. | Trimble, R. | The re-entered imprint on the 7 1/2d of 1857 | 1993 |