Kenji Oikawa Books

Ankoku gurimu dowashu

By Kiyoko Murata, Kenji Oikawa, Kentaro Tanaka, Akira Uno, Komako Sakai, Yuki Sasameya, Akane Chihaya, Hiroshi Homura, Hisaki Matsura, Chiho Makino, Yoko Tawada, Mayumi Nagano, Jacob Grimm

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Circle triangle elephant

By Kenji Oikawa

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"Circle, triangle ... elephant!? A big book of shapes, with a bit of silliness mixed in"--

How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.