Cheng, Ching-Hsue & Lin, Yin. (2002) "Evaluating the best mail battle tank using fuzzy decision theory with linguistic criteria evaluation", European Journal of Operational Research, vol.142, p.147
Fox, E. A, Gonçalves,M.A. Shen,R. (2012). Theoretical Foundations for Digital Libraries: The 5S (Societies, Scenarios, Spaces, Structures, Streams) Approach. Synthesis Lectures on Information Concepts, Retrieval, and Services, 4 (2):1-180.
Gonçalves, M.A. Moreira, B.L. Fox, E.A. Watson, L.T. (2007). "What is a good digital library?–A quality model for digital libraries". Information processing & management, 43 (5):1416-1437.
Mokhtary Asky,Hamid Reza;Alidousty,Sirus (2013) "A revision of digital library concept;Analysis of information site of Iran.doc using the 5S official model". A collection of articles of digital library national Conference. A decade of digital libraries in Iran with a glimpse of future,edited by Mehdy Alipour Hafezy; Research center of sciences and technology of Iran`s information.
Randhawa,J.S and Ahuja,L.S (2017). 5S – a quality improvement tool for sustainable performance: literature review and directions".International Journal of Quality & Reliability management,34 (3):334-361;
Samiee, Mitra (2016). Analysis of Delos reference model and 5S framework on organization and evaluation of digital libraries; Quartely of knowledge studies,6 (2)80-100.
Shen Rao, Goncalves, Andre Fax, Edward Allan.translated by Mehdy Alipur Hafezy & al (2015). Crucial issues of digital libraries.Tehran; Fatemy. Asatyr Parsy
Syaddaty,Leila (2016). Analysis of digi qual model based on the theoretical framework of 5S in digital libraries (MA dissertation) the faculty of psychology and educational sciences, Allame tabatab’i University,Tehran.