Buy Textbooks by the author Binay K. DuttaPrinciples Of Mass Transfer And Separation Processes : https://www.phindia.com/bookdetails/principles-of-mass-transfer-and-separation-processes-dutta-binay-k–isbn-OTc4LTgxLTIwMy0yOTkwLTQ=Heat Transfer: Principles And Applications : https://www.phindia.com/bookdetails/heat-transfer-dutta-binay-k–isbn-OTc4LTgxLTIwMy0xNjI1LTY=Ebooks are also available.