Harry Kondoleon Books

Self torture and strenuous exercise

By Harry Kondoleon

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Self torture and strenuous exercise

By Harry Kondoleon

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Whore of Tiampuan PAJ Books

By Harry Kondoleon

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Diary of a lost boy

By Harry Kondoleon

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Part screwball comedy, part (screwball) tragedy - a brilliantly original novel about love and marriage, gay and straight, in the age of AIDS. At the center, Hector Diaz - seen everywhere around New...

Christmas on Mars.

By Harry Kondoleon

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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.