(1969). Bibliography on the topics of the first International Humanistic Symposium at Delphi: 27 September - 4 October 1969. Αθήναι: Ελληνική Ανθρωπιστική Εταιρεία.
Chicago Style citaatBibliography On the Topics of the First International Humanistic Symposium At Delphi: 27 September - 4 October 1969. Αθήναι: Ελληνική Ανθρωπιστική Εταιρεία, 1969.
MLA citatieBibliography On the Topics of the First International Humanistic Symposium At Delphi: 27 September - 4 October 1969. Αθήναι: Ελληνική Ανθρωπιστική Εταιρεία, 1969.
Let op: Deze citaties zijn niet altijd 100% accuraat.