Source: University of Pennsylvania
Release: Penn World Table 7.1
For more information and proper citation see http://www.rug.nl/research/ggdc/data/pwt/pwt-7.1
Source Indicator: tcgdp
University of Pennsylvania, Total Purchasing Power Parity Converted GDP, G-K method, at current prices for Chad [PPPGDPTDA619NUPN], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/PPPGDPTDA619NUPN, March 23, 2018.