International Symposium on Anaerobic Digestion : Bologna, International Association on Water Pollution Research and Control, Hall, E. R., & Hobson, P. N. (1988). Anaerobic digestion 1988: Proceedings of the fifth International Symposium on Anaerobic Digestion held in Bologna, Italy, 22-26 May, 1988. Pergamon.
Παραπομπή σε μορφή Chicago (17η εκδ.)International Symposium on Anaerobic Digestion : Bologna, International Association on Water Pollution Research and Control, E. R. Hall, και P. N. Hobson. Anaerobic Digestion 1988: Proceedings of the Fifth International Symposium on Anaerobic Digestion Held in Bologna, Italy, 22-26 May, 1988. Oxford: Pergamon, 1988.
Παραπομπή σε μορφή MLA (9th εκδ.)International Symposium on Anaerobic Digestion : Bologna, et al. Anaerobic Digestion 1988: Proceedings of the Fifth International Symposium on Anaerobic Digestion Held in Bologna, Italy, 22-26 May, 1988. Pergamon, 1988.