Literatur: Kishore Jhunjhunwalla and Rezwan Razack - The Revised Standard Reference Guide to Indian Paper Money, published 2012 by Pragati Offset Pvt. Ltd, India, ISBN-10: 81-89752-15-4 and ISBN-13: 978-81-89752-15-6, huge book with 607 pages showing a lot of Indian, Pakistan, Indo-Portuguese notes, Essays, Patterns, Proofs and Trials