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*[http://archive.org/stream/postofficemanual025168mbp#page/n1/mode/2up ''Post Office Manual Volume V: Appendices containing Special Supplementary Rules and Regulations'']. Published under the authority of the Director-General of the Post Office of India Third edition 1908 Archive.org
*[https://archive.org/details/unicodeuniversa00unkngoog/page/n11 ''"Unicode": The Universal Telegraphic Phrase-book. A Code of Cypher Words for Commercial, Domestic and Familiar Phrases in ordinary use in inland and foreign telegrams, with a list of prominent commercial firms who are Unicode users''] 6th edition 1889 Archive.org
:Probable [https://archive.org/details/in.ernet.dli.2015.548621/page/n1 1903 edition], (although not cataloged as such) Archive.org, Public Library of India Collection. Generally poor quality print.
:[http://nla.gov.au/nla.obj-412337031 ''Henry S. King & Co.'s Hand book for homeward-bound travellers from India, Australia and the East''] 1893 National Library of Australia. Includes the [http://nla.gov.au/nla.obj-412337031/view?partId=nla.obj-412339007#page/n12/mode/1up telegraph code] to be used, (from page 12) as words or phrases more than ten letters are charged double.
:Article [http://www.cs.columbia.edu/~CS4HS/talks/codebooks.pdf "Compression, Correction, Confidentiality, and Comprehension: A Look at Telegraph Codes"] by Steven M. Bellovin "Preliminary version – March 25, 2009". cs.columbia.edu
===Indo-European Telegraph===
