Mohamed Firdaus, Mohamed Fakhruzzaman, and Kamarul-azhar Kamarudin. 2022. “Development Prototype of Smart Mailbox That Send Email to User When Parcel Barcode Being Scanned”. Research Progress in Mechanical and Manufacturing Engineering 3 (1): 839-47. https://penerbit.uthm.edu.my/periodicals/index.php/rpmme/article/view/6542.