For public domain text not available online, you could use academic referencing style e.g Harvard style "Jess (2021) My Public licence poems"
Ni foroba sɛbɛn tɛ sɔrɔ ɛntɛrinɛti kan, i bɛ se ka baara kɛ ni kalanko ɲɛfɔli kɛcogo ye misali la Harvard cogoya "Jess (2021) My Public license poems".