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2.
De Coster, Sylvain, and Derume, Emile, Retard pédagogique et situation sociale dans la région du Centre et au Borinage, Brussels, Institut de Sociologie, 1962 .
3.
Gaarder, A.Bruce, 'Organisation of the Bilingual School', in The Journal of Social Issues, XXIII (2 April 1967), pp. 110-120.
4.
Kjolseth, Rolf, 'Bilingual Education Programmes in the United States: For Assimilation or Pluralism?'Paper presented in the section on 'Sociological perspectives on bilingual education' of the Socio-linguistics Programme at the seventh World Congress of Sociology held in Varna, Bulgaria, 14-19 September 1970. A revised version is published in Kjolseth, R., and Sack, F. (hrsgs), Zur Soziologie der Sprache
5.
Ausgewählte Schriften vom VII. Weltkongress der Soziologie und Sozialpsychologie, 1971; in Spolsky, Bernard (ed,), The Language Education of Minority Children: Selected readings, Rowley, Massachusetts, 1972;
6.
and in Turner, Paul R. (ed,), Bilingualism in the Southwest, Tucson, Arizona, The University of Arizona Press, 1972.
7.
Macnamara, John, 'The Bilingual's Linguistic Performance - A Psychological Overview' , in The Journal of Social Issues, XXIII (2 April 1967), pp. 58-77.
8.
Moulin, P., Problèmes d'integration des jeunes immigrés dans l'enseignement primaire et secondaireLiège, Province de Liège, s.d. (1971).
9.
Van der Plank, P.H., Taalassimilatie van Europese taalminderheden. Een inventariserende en hypotesevormende studie naar assimilatieverschijnselen onder Europese taalgroepen. Proefschrift ter verkrijging van de graad van dokter in de sociale wetenschappen aan de Rijksuniversiteit in Utrecht1970. Published in Rotterdam, 1971, by Bronder (offset).
10.
Verdoodt, A., 'Educational Policies on Languages: The Case of the Children of Migrant Workers in the Light of Two Theories'. Paper presented at the 3rd International Congress of Applied Linguistics (Copenhagen), 21-26 August 1972.
11.
Vossen, M., Het lager onderwijs als factor van integratie bij de kinderen van gastarbeiders in Belgisch LimburgLicentiaatsverhandeling. Department of Sociology, KUL, Leuven, 1970 . Unpublished.