James R. Petersen Books

The Playboy advisor on love and sex

By James R. Petersen

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Playboy Advice LuvSex

By James R. Petersen, James Petersen

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The century of sex

By James R. Petersen

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"The Century of Sex is a comprehensive chronicle of sexual mores, relations, and politics in the twentieth century. James R. Petersen argues that the "Sexual Revolution" began generations before th...

Playboy 50 Years

By Jim Peterson, James R. Petersen

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Playboy brunettes

By James R. Petersen

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Playboy

By James R. Petersen

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Playboy

By James R. Petersen

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Playboy

By James R. Petersen

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Playboy

By James R. Petersen

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Playboy

By James R. Petersen

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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.