Authors: Vanderauwera, Jacqueline --- Dardenne, P. --- Nepper, C.
Year: 1978 Publisher: Namur Wesmael-Charlier

Authors: Vanderbecq, P. --- Marot, J. --- Weerts, J. --- Teller, E. --- Van Huffel, X. --- et al. Van Der Elst, H. --- Dolpire, J. --- Mestdagh, S. --- Watillon, B. --- Dardenne, P. --- Roldán-Ruiz, I. --- Langenakens, J.
Year: 2001 Publisher: Bruxelles Ministère des classes moyennes et de l'agriculture