1. Kenton W. Research and Development (R&D) Definition, Types, and Importance // https://www-investopedia-com.translate.goog/terms/r/randd.asp?_x_tr_sl=en&_x_tr_tl=hy&_x_tr_hl=hy&_x_tr_pto=sc
2. Hayes A. What Is the Knowledge Economy? Definition, Criteria, and Example // https://www-investopedia-com.translate.goog/terms/k/knowledge-economy.asp?_x_tr_sl=en&_x_tr_tl=hy&_x_tr_hl=hy&_x_tr_pto=sc
3. Chen J. Intellectual Capital: Definition, Types, Measurement, Importance// https://www-investopedia-com.translate.goog/terms/i/intellectual_capital.asp?_x_tr_sl=en&_x_tr_tl=hy&_x_tr_hl=hy&_x_tr_pto=sc
4. Majaski C. What Is a Developed Economy? Definition, How It Works, HDI Index // https://www-investopedia-com.translate.goog/terms/d/developed-economy.asp?_x_tr_sl=en&_x_tr_tl=hy&_x_tr_hl=hy&_x_tr_pto=sc
5. Human Development Insights// https://hdr-undp-org.translate.goog/data-center/country-insights?_x_tr_sl=en&_x_tr_tl=hy&_x_tr_hl=hy&_x_tr_pto=sc#/ranks