Adding missing book cover

[William]

The Finnish edition ("Tehtävä Mauritiuksella") is missing a book cover.

[Martin]

Please provide a link to relevant edition on Goodreads, and link to an acceptable source for cover

[William]

Link to relevant edition on Goodreads: https://www.goodreads.com/book/show/2...

Link to acceptable source for cover: https://www.antikvaari.fi/teos/tehtav...

[Martin]

What is the nature of that website?
I'm not sure if it is an acceptable source.

[William]

Why not?

[Martin]

I don't know unless you answer my question?

[William]

The link goes to a Finnish website that sells used books

[Martin]

That is not an acceptable source, sorry.
For details of acceptable sources see https://help.goodreads.com/s/article/...