found it, take a look over here :
https://www.mobileread.com/forums/sho...584#post259584 he shows several mock-ups of different cards, take a look on page 2 of the thread too.
you could obviously adapt his idea to your own specifications. and if you want to include the mobileread logo, you can find a pdf of it attached to the first post in the meet-up "how to" thread (sticky in the lounge) ; it's A4 size but you can reduce it of course.