1- Sleeswijk, Froukje Visser. Service design by industrial designers. First Edition, The Netherlands: Delft Technology, 2013. p13
2- William J. Stevenson. Operations Management. USA :McGraw-Hill, 2007.p157, 235
3- Kimitaa, Koji & Shimomuraa, Yoshiki. “Development of the Design Guideline for Product-Service Systems”. Science Direct, “The 6th CIRP Conference on Industrial Product-Service Systems” 2014: P344 – 349
4- Gibbons, Sarah. The 5 Steps to Service Blueprinting. nngroup articles. https://www.nngroup.com/articles/5-steps-service-blueprinting/ (4 February 2018)
5- R. Dan Reid & Nada R. Sanders. Operations Management, Product Design & Process Selection, 4th Edition. USA: © Wiley. 2010. p57
6- Aquino, Lauren Shluzas & others. “Comparing Novice and Expert User Inputs in Early Stage Product Design”. Proceedings of the 5th International Congress of International Association of Societies of Design Research (IASDR). Tokyo: Japan, 2013. p9
7- Sassanellia, Claudio. & others. “Towards a Lean Product Service Systems Design” state of the art, opportunities and challenges, 7th Industrial (PSS) Conference, Procedia CIRP 30 .2015. 191 – 196.
8- Apple (2010). Corporate Website. www.apple.com (16 August 2010)
9- Stickdorn, Marc. Schneider, Jakob. & the co-authors: “This is service design thinking, Basics - Tools - Cases”. Amsterdam: BIS Publishers. 2011. p65
10- Horváth, Dóra. “The Role of Product Design in Product Related Consumer Judgements”. Budapest University of Economic Sciences and Public Administration. Budapest. 2001. P.17-25
11- Rondinia, Alice. & others. “How to design and evaluate early PSS concepts”. the Product Service Concept Tree. ScienceDirect. Procedia CIRP 50. 2016. 366 – 371
12- Bertonia, Alessandro. & others. “Expanding Value Driven Design to meet Lean Product Service Development”. 7th CIRP Conference. Procedia CIRP 30. 2015. 197 –202
13- Tuan A, Tran and Joon Y, Park. “Development of integrated design methodology for various types of product – service systems”. Digital Product Lab. Department of Industrial and Systems Engineering. Dongguk University. Pil dong. Jung gu. Seoul: KOREA. Journal of Computational Design and Engineering.Vol.1,No.1.2014. 37~47
14- Buchanan, R. “Design Research and the New Learning”. Design Issues. Autumn 2001, Vol. 17, No. 4, Pages 3–23.
15- Nukkads. light-sensor (2018). Corporate Website, https://nukkads.com/products/smart-pir-lock-down-light-sensor , https://www.nukkads.com/products/smart-anti-theft-device-tracker (12 September 2018)
16- Maslakovic, Marko. smart jewelry for women safety
https://gadgetsandwearables.com/2017/07/03/ivy/ (12 September 2018)
17- Wen,YaoCai. Memorizig the right cuppa java, 2012, Corporate Website. http://www.yankodesign.com/2012/10/22/memorizing-the-right-cuppa-java/ (12 Septemper 2018)