Unitrade Press, Chung, A., & Narbonne, R. F. The New Specialized Catalogue of Canada Post Official First Day Covers: 1997 Covering 25 years of Canada Post Official First Day Covers (Primera edición.).
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Chicago-čujuhus (17. p.)
Unitrade Press, Andrew Chung, juo R. F. Narbonne. The New Specialized Catalogue of Canada Post Official First Day Covers: 1997 Covering 25 Years of Canada Post Official First Day Covers. Primera edición.
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MLA-čujuhus (9. p.)
Unitrade Press, et al. The New Specialized Catalogue of Canada Post Official First Day Covers: 1997 Covering 25 Years of Canada Post Official First Day Covers. Primera edición.
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