Portia Da Costa Books

Shadowplay

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FANTASY. Darkness has fallen on the lands of the sun as an army of misshapen fey spill out from beyond the Shadowline. At their head is Yasammez, dark creature of nightmare. A furtive bargain was s...

Women in Lust

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Entre les lignes

By N A

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Der Chef

By Portia DaCosta

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Der Club der Lust

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La doble vida de Gwendolynne Price

By Portia Da Costa

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12 Shades of Surrender Bound

By Lisa Renee Jones, Alegra Verde, Tiffany Reisz, Adelaide Cole, Elisa Adams

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In the Flesh

By Portia Da Costa

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Kiss It Better

By Portia Da Costa

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Shadow Play

By Portia Da Costa

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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.