Ralph F. Hefferline Ph.D. Books

Gestalt therapy
Gestalt therapy

By Frederick S. Perls, Ralph F. Hefferline Ph.D., Paul Goodman

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This edition contain an introductory note write by Frederick S. Perls

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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.

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