John Semper Books

The Opposites Game

By Megan Brown, Kirsten Larsen, John Semper, Jocelyn Jamison, Evelyn A. Gabai

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1 v. (unpaged) : 21 cm Jay Jay the Jet Plane and Herky the Helicopter play a game to teach Snuffy about opposites

Cyborg Vol. 1: The Imitation Of Life

By John Semper Jr., Semper, John Jr, John Semper

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"When a shocking discovery about his own origin makes Victor Stone question everything he thought he knew about his identity and his humanity, it seems Cyborg might be more machine than man after a...

Cyborg Vol. 3: Singularity

By John Semper Jr., John Semper

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The Singular Affair Of The Missing Ball

By John Semper Jr., John Semper

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Peter Finds Mary Jane

By John Semper

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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.