1. E R Hery, Classification of Fingerprints, published by His Majesty's Stationary Office, England 1913.
2. Harry Battley, Single Fingerprints, A new practical method of classifying and fitting single fingerprint and fragmentary impressions, published by His Majesty's stationary office, 15 Donegal Space, West Belfan, 1930.
3. S K Chatterjee, Finger Palm and Sole prints, Kosa Publishers, Calcutta, 1967.
4. A Grasselli, On the automatic classification of Fingerprints—some considerations on the suggestive interpretation of pictures, inMathodology of Pattern Recognition, Academic Press, NY, 1969.