1. Keaton, W. (2022) Economy: What It Is, Types of Economics, Economic Indicators. Investopedia. https://www.investopedia.com/terms/e/economy.asp
2. Hewings, G.J. (1985) Regional Input-Output Analysis. Reprint. Edited by Grant Ian Thrall. WYU Research Repository, 2020.
3. Extraction of lithium from primary and secondary sources by pre-treatment, leaching and separation: A comprehensive review
4. Queiroz, C. and Gautam, S. (1992) Road Infrastructure and Economic Development: Some Diagnostic Indicators. World Bank, Washington DC.
5. (2011) World’s Most Dangerous Roads. Renegade Pictures. https://www.imdb.com/title/tt2078521/