Publishing your own book, e-book.

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Obtaining an ISBN for Your Self-Published Book Obtaining an ISBN for Your Self-Published Book If you look at any commercially available book, the back cover lists the book's International Standard Book Number (ISBN) and barcode, along with the book's price. Any book that's sold anywhere in the world must have a unique ISBN. An ISBN: What it is and why your book needs one The ISBN system is an internationally recognized book identification system that's been in use since 1970.
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Publishing your own book, e-book - team curated

How to Self-Publish a Book
Self-Publishing Tutorial: The Top 10 Things You Should Know about Self-Publishing Your Book.
How to Self-Publish a Book
E-Books and Self Publishing Part 1
Naming and evolution[edit] The Kindle name was devised by branding consultant Michael Cronan who was asked by Lab 126 to name the product. Cronan and partner Karin Hibma suggested Kindle, meaning to light a fire.[3] They felt this was an apt metaphor for reading and intellectual excitement.[4] KDP files and Amazon Kindle KDP files and Amazon Kindle
EPUB (short for electronic publication) is a free and open e-book standard by the International Digital Publishing Forum (IDPF). Files have the extension .epub. EPUB is designed for reflowable content, meaning that an EPUB reader can optimize text for a particular display device. EPUB

EPUB

ePub for eBooks - Tech review with Peter Marks
How to Create .epub with Pages
PDF: Portable Document Format (files) Portable Document Format (PDF) is a file format used to present documents in a manner independent of application software, hardware, and operating systems.[1] Each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, graphics, and other information needed to display it. In 1991, Adobe Systems co-founder John Warnock outlined a system called "Camelot"[2] that evolved into PDF. While Adobe Systems made the PDF specification available free of charge in 1993, PDF was a proprietary format, controlled by Adobe, until it was officially released as an open standard on July 1, 2008, and published by the International Organization for Standardization as ISO 32000-1:2008,[3][4] at which time control of the specification passed to an ISO Committee of volunteer industry experts. PDF: Portable Document Format (files)
Selling your book or e-book