John F Sullivan Books

Principles of supervision in law enforcement agencies

By Gilbert H. Skinner

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Mary Huckleberry Grows Up

By Sullivan John F.

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Gatekeeper: Memoirs Of A CIA Polygraph Examiner

By John F Sullivan, John F. Sullivan, Sullivan, John F

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John F. Sullivan was a polygraph examiner with the CIA for thirty-one years, during which time he conducted more tests than anyone in the history of the CIA's program. The lie detectors act as the...

Gatekeeper

By John F Sullivan, John F. Sullivan, Sullivan, John F

Average: 0.00, 0 Ratings

John F. Sullivan was a polygraph examiner with the CIA for thirty-one years, during which time he conducted more tests than anyone in the history of the CIA's program. The lie detectors act as the...

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.