^ ACS Colour Catalogue. Auckland City Stamps. Retrieved on 2008-01-10.
^ Phila India : 2005 : Guide Book (1800 - 2004). Vedams Books. Retrieved on 2008-01-10.
^ STAMPS OF INDIA COLLECTORS COMPANION. STAMPS OF INDIA. Retrieved on 2008-01-10.
Richard McP. Cabeen, Standard Handbook of Stamp Collecting (Collectors Club, 1979)
Edward J. Nankivell, Stamp Collecting as a Pastime Stanley Gibbons Philatelic Handbooks (1902); reprinted, ARC Manor (2006); Dodo Press (2007) ISBN 1406530581
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