Christopher Renstrom Books

Ruling Planets

By Christopher Renstrom

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Ruling Planets: Your Astrological Guide to Life's Ups and Downs

By Christopher Renstrom

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The Cosmic Calendar Lib E

By Eric Michael Summerer, Christopher Renstrom

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The Cosmic Calendar

By Christopher Renstrom

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Go from astrology-curious to cosmically empowered with this expert guide to decoding the stars for everyday lifeTiming is everything--and astrology is a personalized calendar designed just for you....

Rise and Shine

By Christopher Renstrom

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Unlock the secrets of who you are–as written in the stars.Astrology offers us a blueprint of our true selves, captured in the sky at the time we were born. Your rising sign is the face you show to...

Rise and Shine

By Christopher Renstrom

Average: 0.00, 0 Ratings

Unlock the secrets of who you are–as written in the stars.Astrology offers us a blueprint of our true selves, captured in the sky at the time we were born. Your rising sign is the face you sh...

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.