Changes

* Bakalian, A., Wright, A., Otis, R. and Azevedo Netto, J. (1994). [https://www.ircwash.org/resources/simplified-sewerage-design-guidelines Simplified Sewerage: Design Guidelines]. UNDP-World Bank Water and Sanitation Program, Washington, D.C., US.:Available at: [http://documents.worldbank.org/curated/en/home documents.worldbank.org/curated/en/home] (Design guidelines for manual calculations)

* Mara, D. D. (1996a). [https://www.susana.org/en/knowledge-hub/resources-and-publications/library/details/2972 Low-Cost Sewerage]. Wiley, Chichester, UK. (Assessment of different low-cost systems and case studies)

* Mara, D. D. (1996b). Low-Cost Urban Sanitation. Wiley, Chichester, UK. pp. 109-139. (Book; Comprehensive summary including design examples)

* Mara, D. D. (2005). [https://www.researchgate.net/publication/288395536_Sanitation_for_all_in_periurban_areas_Only_if_we_use_simplified_sewerage Sanitation for All in Periurban Areas? ] Only If We Use Simplified Sewerage. Water Science & Technology: Water Supply 5 (6): 57-65. (An article summarizing the technology and its potential role in urban sanitation)

* Mara, D. D., Sleigh, A. and Tayler, K. (2001). [https://www.ircwash.org/sites/default/files/332-01PC-16418.pdf PC-Based Simplified Sewer Design]. University of Leeds, Leeds, UK.: Available at: www.efm.leeds.ac.uk/CIVE/Sewerage/ (Comprehensive coverage of theory and design including a program to be used as a design aid)

* Watson, G. (1995). [https://sswm.info/node/5857 Good Sewers Cheap? Agency-Customer Interactions in Low-Cost Urban Sanitation in Brazil]. Water and Sanitation Division, The World Bank, Washington, D.C., US.:Available at: www.wsp.org (A summary of large-scale projects in Brazil)