Stock, James H., and Mark W. Watson, Introduction to Econometrics, Fourth edition (Harlow, United Kingdom: Pearson Education Limited, 2020) <https://bibliu.com/users/saml/samlUCL?RelayState=eyJjdXN0b21fbGF1bmNoX3VybCI6IiMvdmlldy9ib29rcy85NzgxMjkyMjY0NTIzL3BkZjJodG1sZXgvaW5kZXguaHRtbCJ9>