Eric Marcus Books

What If?

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"No question goes unanswered in this important book about being gay. All the basics--and not-so-basics--are covered in more than one hundred questions asked by real teens."--Amazon.com.

Coming out to play

By Robbie Rogers

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When Robbie Rogers stepped onto the field for the LA Galaxy in 2013, he made history as the first openly gay man to play in a major US professional sport. Coming Out to Play tells Rogers's harrowin...

Coming out to play

By Robbie Rogers

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Pessimisms

By Eric Marcus

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Complete Training Guide Data Workbook

By Michael Polis, Jon C. Thompson, Leo J. Wolansky, Iowa State University Press, Intellicard, Rodney Ledward, IQ Pubs, Chamberlain, Ronald H. Wachsberg, Eric Marcus, Stephen R. Baker, Kimmel, Holodmy, Kirk Miller

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Out with it

By Al Desetta, Eric Marcus

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A collection of essays in which teenagers examine issues related to homosexuality, such as coming out, homophobia, and relationships with family and friends.

Manual del Pesimista

By Eric Marcus

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Manual del pesimista

By Eric Marcus

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Is It A Choice? 3rd Ed.

By Eric Marcus

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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.