Can I recommend books with a co-author?

Yep, you bet!

We don't have full support in our software, but I hope to add it in 2023/2024. For now, we can make a single entry work for two people, and then I will fix it when we fully add the feature. This means that the picture will be our stock image, but we will improve that down the road so we can also do a picture of each person. 

P.S. Would you like to help us build features like this faster?

I launched a membership program for founding members at the urging of authors and readers. 100% of the money goes toward developing new features and my goal of hiring a full-time developer in 2023 (currently, we only have one part-time developer).