Rob Portlock Books

Faith in Orbit

By Rob Portlock, Doug Hall, Ed Koehler, Mary Chambers

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My Dad ran over a frog

By Rob Portlock

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On Christmas Eve, a boy brings home to recuperate a frog his father has hit with a car, and it becomes an integral part of the family's Christmas.

Someone's trying to cut off my head

By Rob Portlock

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Max's imagination makes his first haircut a frightening experience, until he gains control of himself and his thoughts.

Fed up with her family, Haley gets her wish of being whisked to the moon and all around the solar system, but despite the marvel of everything God has created in space she finds herself missing tho...

Buster the biker sheep

By Rob Portlock

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Buster makes fun of the other sheep for believing in the Shepherd until he gets into trouble with the wolf.

The adventures of Father Faber

By Rob Portlock

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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.