CES (2008), Practical Monitoring and Evaluation: A Guidebook for Voluntary Organisations. 3rd edition, National Council for Voluntary Organisations, London.
See also from NCVO guidance resources for evaluation at: https://knowhownonprofit.org/organisation/impact
Her Majesties Treasury (2011), The Magenta Book: Guidance for evaluation. Magenta-Combined, London: www.gov.uk/government/uploads/system/uploads/attachment_data/file/220542/magenta_book_combined.pdf
United Kingdom Evaluation Society (2013), Guidelines for Good Practice in Evaluation. London: UKES www.evaluation.org.uk/images/ukesdocs/UKES_Guidelines_for_Good_Practice_January_2013.pdf
Useful further sources and reading
Fox, C., Grimm, R. and Rute, C. (2016). An Introduction to Evaluation. London: Sage.
Hall, I. and Hall, D. (2004). Evaluation and Social Research: Introducing Small-scale Practice. Palgrave Macmillan. Basingstoke.
Mertens, D.M. and Wilson, A.T. (2012). Programme Evaluation Theory and Practice: A Comprehensive Guide. New York. Guildford Press.
Parsons, D. (2017). Demystifying Evaluation: Practical approaches for researchers and users. Policy Press. Bristol.