Roger E. Olson Books

Questions to All Your Answers: The Journey from Folk Religion to Examined Faith

By Roger E. Olson

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How to Be Evangelical without Being Conservative

By Roger E. Olson

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Four Views on the Spectrum of Evangelicalism

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The SCM Press A-Z of evangelical theology

By Roger E. Olson

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The Westminster Handbook to Evangelical Theology The Westminster Handbooks to Christian Theology

By Roger E. Olson

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"The Westminster Handbook to Evangelical Theology is a critical survey of the main persons, events, controversies, concepts, and institutions of twentieth-century evangelical theology. It will intr...

Reformed and Always Reforming

By Roger E. Olson

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Reclaiming pietism

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20th Century theology

By Stanley Grenz, Stanley J. Grenz

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Who needs theology?

By Stanley J. Grenz

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The Story of Christian Theology

By Roger E. Olson

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"In this panoramic work of historical theology, theologian Roger Olson vividly recounts the deeds and words of the cultists and Apostolic Fathers of the second century, the clash between the monume...

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.