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"
Publiskuo domena tekstam, kas nav daīmams tīšsaistē, varit lītuot akademiskū atsaucis stylu, par pīmāru, Hārvardys stylu "Jess (2021) My Public license poems"