The "original" Scrum book
https://read.amazon.com/kp/card?asin=0130676349Q&preview=inl...
Stuff on lean manufacturing (yes. manufacturing!) https://www.amazon.de/dp/B000SEGIVS?ref_=cm_sw_r_kb_dp_ocvTD...
https://www.amazon.de/dp/B002LHRM2O?ref_=cm_sw_r_kb_dp_I9SSD...