, Extending the Audio-Lingual Approach : some Psychological Aspects, Language Learning. The Individual and the ProcessEds. E.W. Najam & C. Hodges , The Hague : Mouton 1966, 63–73.
, Language Communication and Second Language Learning, The Psychology of Second Language LearningEds. P. Pimsleur & T. Quinn , Cambridge : At the University Press 1971, 171–179.
, An Experiment in Improving Achievement in Foreign Language Through Learning of Selected Skills Associated With Language Aptitude. Stanford University 1969.
, Some Reflexions on the Learning and Teaching of a Second Foreign Language in the Third Grade of the Primary School, Scientia Paedagogica Experimen-talis9 1972 : 62–79.
, The Psychologist and the Foreign Language Teacher, Language Learning. The Individual and the ProcessEds. E.W. Najam & C. Hodges , The Hague: Mouton 1966, 63–73.