Stock JH and Watson MW, Introduction to Econometrics (Fourth edition, Pearson Education Limited 2020) <https://bibliu.com/users/saml/samlUCL?RelayState=eyJjdXN0b21fbGF1bmNoX3VybCI6IiMvdmlldy9ib29rcy85NzgxMjkyMjY0NTIzL3BkZjJodG1sZXgvaW5kZXguaHRtbCJ9>