LSJ
ἡ, common utility, Phld. Rh. 1.174 S. (pl.), D.S. 1.51; on the form (κοίνεια Just. Nov. 7.1 2 Ep.), cf. EM 462.21.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
ἡ, = κοινωφέλεια, EM. 462.11.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)