For public domain text not available online, you could use academic referencing style e.g Harvard style "Jess (2021) My Public licence poems"
Internetde elýeterli bolmadyk köpçülige açyk tekst üçin akademiki salgylanma stilini ulanyp bilersiňiz, mysal üçin Garward stili "Jess (2021) Meniň jemgyýetçilik ygtyýarnama degişli goşgularym"