Muḥāḍarāt fī bayān al-akhtaʾ al-ʿilmiyya al-tārīkhiyya allatī ishtamala ʿalayhā kitāb fī al-shiʿr al-jāhilī wa-yalīhi qarār al-niyāba fī kitāb al-shiʿr al-jāhilī