(1970), A methodological study comparing the Audio-lingual Habit Theory and the Cognitive Code Learning Theory, MLJ54: 257–266. doi: 10.1111/j.1540‑4781.1970.tb02267.x
(1968), A Methodological Study comparing the Audio-Lingual Habit Theory and the Cognitive Code Learning Theory, MLJ, 42: 268–279. doi: 10.1111/j.1540‑4781.1968.tb01905.x
(1976), “Lingwistyczne uwarunkowania glottodydaktyki”, in: Glottodydaktyka a lingwistyka, ed. F. Grucza , Wydawnictwa Universytetu Warszawskiego (Warsaw University Press).
Ingram E. , and P. Smith, Jr.
(1972), “A. comparison of the Cognitive and Audiolingual approaches to foreign language instruction: The Pennsylvania Language Research Project”, IRAL X/4.
(1979), “An experiment on the effectiveness of the language laboratory in teaching English to university students”, Kwartalnik Neofilologiczny, XXVT, 1/1979, 101–110.