1. 1. Case Study on Different Vending Machines by Asmita P. Bodhale1 and Prof. J. S. Kulkarni2(International Research Journal of Engineering and Technology (IRJET)
   2.  Unmanned Coffee Vending Machine by Dinesh Kumar and A. Hariharan. (2019 International Conference on Vision Emerging Trends in Communication and Networking (ViTECoN)).
   3. Design of a Control System for a Vending Machine by eriyeti murena and vennan sibanda. (© 2020 The Authors. Published by Elsevier B.V.)
   4. THE COMMODITY VENDING MACHINE Susanne GRUBER, Renat BUBER, Bernhart RUSO, Johannes GADNER. (FORUM WARE international 2005/02
   5. Design and Implementation of automatic vending machine Based on the short massage payment by ZHANG Wen and ZHANG Xin Long (2010 IEEE).
   6. Iot Based Automatic Milk ATM Machine for Rural Area People Vijayaragavan. M, R. Rajendirakumar and R. Niketan. (International Journal of Innovative Technology and Exploring Engineering (IJITEE))
   7. DEVELOPMENT OF LOW-COST PORTABLE AUTOMATIC MILK VENDING MACHINE by Mr. Dinesh Kumar (International Journal of Pure and Applied Mathematics Volume 119 No. 18 2018, 2639- 2648)