Robert Walter Funk Books

Greek Grammar of the New Testament and Other Early Christian Literature

By Robert Walter Funk, Albert Debrunner, Friedrich Wilhelm Blass

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The Gospel of Jesus

By Robert Walter Funk

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The voice of Jesus has for centuries been obscured and his vision skewed even by well-intended gospel writers, who transmitted his words to serve their own concerns. The Gospel of Jesus frees Jesus...

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.