References
Expert Group on Consumer Price Indices. https://unece.org/expert-group-consumer-price-indices
Hoffmann, E., M. Chamie (1999): Standard Statistical Classifications: Basic Principles. Paper for the United Nations Statistical Commission, thirtieth session, 1999. Available on https://unstats.un.org/unsd/classifications/bestpractices/basicprinciples_1999.pdf
ILO, IMF, Eurostat, OECD, UNECE, World Bank (2020): Consumer Price Index Manual: Concepts and Methods. Available on https://www.imf.org/en/Data/Statistics/cpi-manual
Ottawa Group on Price Statistics. https://stats.unece.org/ottawagroup/
United Nations Statistics Division (2018): Classification of Individual Consumption According to Purpose (COICOP) 2018. Available on https://unstats.un.org/unsd/classifications/econ/