Kenneth G. Wilson (1923–). The Columbia Guide to Standard American English. 1993.
yet (adv.)
raises many conservative hackles at all levels when it’s used with a past tense of the auxiliary do, as in Did she return my call yet? instead of Has she returned my call yet? or simply Did she return my call? The locution occurs frequently in the lower Conversational levels, but the usage is clearly Nonstandard in all writing other than Informal contexts.
