Rerum novarum, Laborem exercens 2000 : symposium from Rerum novarum to Laborem exercens: towards the year 2000 ..., Roma, 3-5/IV 1982- Pontificia Commissio Iustitia et Pax - Symposium from Rerum Novarum to Laborem Exercens, Towards the Year 2000 (Pontificia Commissio Iustitia et Pax, 1982)