Johan Carl Thom Books

On frank criticism

By Philodemus Of Gadara

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Cleanthes Hymn to Zeus

By Johan C. Thom, Johan Carl Thom

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The Pythagorean golden verses

By Johan Carl Thom

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This book is a commentary on the Pythagorean Golden Verses, a neglected, but once very popular poem of the Hellenistic period. The goal of the poem is to introduce its readers to the basic moral, r...

Cosmic Order and Divine Power

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The treatise De mundo offers a cosmology in the Peripatetic tradition which subordinates what happens in the cosmos to the might of an omnipotent god. Thus the work is paradigmatic for the philosop...

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.