Helal, A. H., & Weiss, J. W. (1987). Impact of Information Technology on International Library Cooperation. Publications of Essen University Library 9. Essen Symposium (Essen, West Germany, September 8-11, 1986).
Citazione stile Chigago Style (17a edizione)Helal, Ahmed H., e Joachim W. Weiss. Impact of Information Technology on International Library Cooperation. Publications of Essen University Library 9. Essen Symposium (Essen, West Germany, September 8-11, 1986). 1987.
Citatione MLA (9a ed.)Helal, Ahmed H., e Joachim W. Weiss. Impact of Information Technology on International Library Cooperation. Publications of Essen University Library 9. Essen Symposium (Essen, West Germany, September 8-11, 1986). 1987.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.