Martha Derman Books

And Philippa makes four

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Sixth-grader Philippa feels her life becoming intolerable as her widowed father becomes romantically involved with a fellow architect, who is also the mother of Philippa's school enemy Libby.

Tales from Academy Street

By Martha Derman

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A collection of stories in which mysterious, spooky, and funny things happen to the kids who live on Academy Street.

The friendstone

By Martha Derman

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Eleven-year-old Sally's view of life expands when she becomes friends with a Jewish girl the summer of 1929, which she spends in the Catskills with her beloved great-grandmother.

The friendstone

By Martha Derman

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Eleven-year-old Sally's view of life expands when she becomes friends with a Jewish girl the summer of 1929, which she spends in the Catskills with her beloved great-grandmother.

And Philippa Makes Four

By Martha Derman

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Tales from Academy Street

By Martha Derman

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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.