Torsten Passie Books

"LSD has a controversial and extraordinary reputation, due to the special effects it can induce on human consciousness. Its experimental use lead to some groundbreaking discoveries about the brain...

Healing with Entactogens

By Ralph Metzner Ph.D., Torsten Passie M.D.

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Bewusstseinszustande

By Torsten Passie

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Phanomenologisch-anthropologische Psychiatrie und Psychologie

By Torsten Passie

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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.