L'enseignement des langues et l'ecolier : rapport d'un colloque international /
International Meeting of Representatives of Institutions and Experimental Schools concerned with Second Language Teaching in Primary Education - Research and Development(1966 :Hamburg)
Stern, Hans Heinrich.
Carroll, John Bissell.
Mackey, William F.
Hamburg :  Institut de l'Unesco pour l'Éducation, 
1971.
Originally published as Languages and the young school child.
Languages, Modern