ISBN 9787771977 hat failed the check­sum digit test.
The following 14 formally correct ISBNs were determined. Starting from these ISBNs the value 9787771977 that you input could have resulted frome one error (error in one digit or transposition of two digits.) You can now check using the links given for the catalogs of amazon.co.uk, amazon.com and amazon.de whether any book is listed for the respective URL. To the home page
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Tiu cxi pagxo en Esperanto (x-igata)
ISBN prefix group: China, People's Republic
ISBNas­su­med er­rorCatalogs for checking
7-7877-9197-71st and 6th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Denmark
ISBNas­su­med er­rorCatalogs for checking
87-87771-97-7first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Sweden
ISBNas­su­med er­rorCatalogs for checking
91-87771-97-7second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Thailand
ISBNas­su­med er­rorCatalogs for checking
974-7771-97-7third digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Nigeria
ISBNas­su­med er­rorCatalogs for checking
978-47719-7-7fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
978-77519-7-7sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
978-77712-7-7eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
978-77719-2-7ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
978-77719-7-8tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
978-77749-7-7seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
978-77779-1-77th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
978-79719-7-7fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Argentina
ISBNas­su­med er­rorCatalogs for checking
987-777-197-72nd and 3rd digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Tanzania
ISBNas­su­med er­rorCatalogs for checking
9987-771-77-72nd and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de

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