For public domain text not available online, you could use academic referencing style e.g Harvard style "Jess (2021) My Public licence poems"
Fún ọ̀rọ̀ ààyè gbogbogbò tí ò sí lórí ayélujára, o lè ló sítáì ìtọ́kasí akadá, bí àpẹẹrẹ sítáì Harvard "Jess (2021) Àwọn ewì iwé-àṣẹ gbogbogbò mi"