Klakowicz (B.E.), STUD. PAP., XX, 1981, PP. 135- 138., German

1980 Bagnall (Roger S.) Sijpesteijn (Pieter Johannes) Worp (Klaas Anthony) A CATALOGUE OF THE COLLECTION OF GREEK OSTRACA IN THE NATIONAL MUSEUM OF ANTIQUITIES AT LEIDEN WITH A CHAPTER ON THE GREEK OSTRACA IN THE PAPYROLOGICAL INSTITUTE OF THE UNIVERSITY OF LEIDEN. XII- 233 P., 1 VOL. DE 100 PL.