. (2009). Producer Price Index Manual. USA: International Monetary Fund. Retrieved May 11, 2023, from https://www.elibrary.imf.org/view/book/9781589063075/9781589063075.xml
. Producer Price Index Manual. USA: International Monetary Fund, 2009. < https://doi.org/10.5089/9781589063075.069>. Web. 11 May. 2023.
. Producer Price Index Manual, (USA: International Monetary Fund, 2009) accessed May 11, 2023, https://doi.org/10.5089/9781589063075.069
(2009). Producer Price Index Manual, USA: International Monetary Fund. available from: < https://doi.org/10.5089/9781589063075.069> [Accessed 11 May 2023]