Hans J Eysenck Books

Test Your IQ

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A detailed explanation of what IQ means and how it is measured – including eight tests you can take! In Test Your IQ, Professor Hans Eysenck, the world-renowned expert on IQ testing, presents an in...

Know Your Own Psi Q

By Hans Jurgen Eysenck, Carl Sargent

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You and neurosis

By Hans Jurgen Eysenck

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Lexikon Der Psychologie 1

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Lexikon der Psychologie

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Lexikon der Psychologie

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Lexikon der Psychologie

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Lexikon der Psychologie

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Structure and Measurement of Intelligence

By Hans Jurgen Eysenck, D. W. Fulker

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Measurement of Intelligence

By Hans J Eysenck

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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.