For public domain text not available online, you could use academic referencing style e.g Harvard style "Jess (2021) My Public licence poems"
Publiskuo domena tekstam, kas nav daīmams tīšsaistē, varit lītuot akademiskū atsaucis stylu, par pīmāru, Hārvardys stylu "Jess (2021) My Public licence poems"