Peter Otto Jacobsen Books

A Family on a Pacific Island Families Around the World

By Peter Otto Jacobsen, Preben Sejer Kristensen

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A family in Hong Kong

By Peter Otto Jacobsen

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Text and photographs present the home, work, school, recreation, and day-to-day activities of the Cheng family who lives on a houseboat in Hong Kong.

A family in Iceland

By Peter Otto Jacobsen

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Text and photographs present the home, work, school, recreation, and day-to-day activities of the Finnsson family who lives on a farm near Reykjavik, Iceland.

A family in Thailand

By Peter Otto Jacobsen

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Text and photographs present the home, work and day-to-day activities of the Pomwat family who live in a small town near Bangkok, Thailand.

Family in India

By Peter Otto Jacobsen

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A family in Japan

By Peter Otto Jacobsen

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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.