I understand that even books written in Finnish not infrequently have titles and are available for purchase.
Sometimes, yes.
Well, if you're still interested: the book is called "Opastin" and here's a link to buy it. I don't believe they ship outside Finland, though.
As in Joshua Blaine's original description (below), but may be used to brag about things you've accomplished either this month (December) or the previous one (November), assuming that you haven't brought it up in any earlier Monthly Bragging Thread.