John A. Haslem Books

Webster's New World Pocket Style Guide

By John A. Jr. Haslem

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Webster's New World Notebook Grammar and Punctuation Guide

By John A. Haslem

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The Investors Guide to Mutual Funds

By John A. Haslem

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Webster s new style guide

By John A. Haslem

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Briefly surveys the rules of English grammar, punctuation, and capitalization, offers examples of correct usage, and lists abbreviations and forms of address.

Webster s New Pocket Style Guide

By John A. Haslem

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Mutual Funds

By John A. Haslem

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"This authoritative book enables readers to evaluate the various performance and risk attributes of mutual funds, while also serving as a comprehensive reference for students, academics, and genera...

Understanding Mutual Funds

By John A. Haslem

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Bank funds management

By John A. Haslem

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Webster s New Pocket Style Guide Custom

By Haslem

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Mutual Funds

By John A. Haslem

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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.