For public domain text that is not available online, you could use academic referencing style e.g Harvard style "Jess (2021) My Public license poems"
ⵜⵣⵎⵔⴷ ⴰⴷ ⵜⵙⵙⵎⵔⵙⴷ ⵜⴰⵎⴰⵎⴽⵜ ⵏ ⵜⵙⴰⵖⵓⵍⵜ ⵜⴰⴽⴰⴷⵉⵎⵉⵜ ⵉ ⵓⴹⵕⵉⵚ ⵏ ⵡⴰⴳⵍⴰ ⴰⴳⴷⵓⴷⴰⵏ ⵏⵏⴰ ⵓⵔ ⵉⵙⴰⴳⴰⵏ ⴳ ⵉⴼⵉⵍⵉ, ⵙ ⵎⴷ. ⵜⴰⵎⴰⵎⴽⵜ ⵏ ⵀⴰⵔⴼⵔⴷ "ⵊⵉⵙⵙ (2021) ⵜⵉⵎⴷⵢⴰⵣⵉⵏ ⵉⵏⵓ ⵏ ⵜⵓⵔⴰⴳⵜ ⵜⴰⴳⴷⵓⴷⴰⵏⵜ"