You can create an ISBN-13 number using our site: to do so compose following url:
http://www.barcoderobot.com/isbn-13/9780140150988(you need to provide your ISBN-13 number instead of 9780140150988, use only digits no hyphens or spaces) :)
Here is how to compose your ISBN-13:
1. First 3 digits are 978
2. Next 9 digits are nine digits from your ISBN-10 number (they should start in the range of 570-579 for Denmark).
3. Last digit is the check digit. Enter any digit and our site will calculate the right one.
4. Once you have enetered the correct data an ISBN-13 barcode will appear. You can purchase and download EPS image file that could be used to produce art work for book cover.
P.S. Do not us price add-on it is not necessary in Europe!
Success!