Christos Simelidis Books

Life of the Virgin Mary

By John Geometres, Nicholas Constas, Christos Simelidis

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Selected poems of Gregory of Nazianzus

By Gregory Of Nazianzus Saint

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Selected Poems of Gregory of Nazianzus I.2.17 II.1.10 19 32

By Christos Simelidis

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St. Gregory of Nazianzus' (ca. AD 330-390) classicizing Christian verse is the earliest Greek verse of its kind that survives in any great quantity. This is a critical edition, with introduction an...

Intro to Astronomy by Theodore

By Emmanuel Paschos, Christos Simelidis

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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.