If you want to improve your customer journey with gamification, I'll recommend Yukai Chou's blog. Must follow and read all the articles. He coined the Octalysis Framework which helps us to engage and motivate users. He has also written a book entitled "Actionable Gamification".
I think this one is the best Qur'an translation. The dictions and notes are very clear, concise and somehow beautiful to read. It's very calming. I always keep this translation on my bedside.
Good design means a good business too, and bad design can harm many parties. To avoid the bad design, we need to know what, why and how bad is bad. This book not only gives us many examples of the goods, the bads, and the impact but also the perspectives & experiences of seasoned designers. Empathy is not a buzzword for designers, this book is the proof.
Creative & strategic thinking are 2 very important and required things for a design leader. In the tech industry, we can't separate the design & product, the product's matrix will affect the design and vice versa. That is why we need to know the strategy behind product development and business strategies as well. This book has it all, for those designers who struggle with how to communicate better with stakeholders, please grab this one and thank me later!