Office for Official Publications of the European Communities, European Centre for the Development of Vocational Training, Bertzeletou, T., & Guerra, D. (1991). Guide to transnational cooperation in the field of distance training. Office for Official Publications of the European Communities ; UNIPUB, [distributor].

Office for Official Publications of the European Communities, European Centre for the Development of Vocational Training, Tina Bertzeletou, and Duccio Guerra. Guide to Transnational Cooperation in the Field of Distance Training. Luxembourg : Lanham, MD: Office for Official Publications of the European Communities ; UNIPUB, [distributor], 1991.

Office for Official Publications of the European Communities, et al. Guide to Transnational Cooperation in the Field of Distance Training. Office for Official Publications of the European Communities ; UNIPUB, [distributor], 1991.