Idzelis, Rolandas Vitalius F. „The Interplay of Spontaneous (“Natural”) and Deliberate (“Artificial”) in the Study of International English“. Kalbotyra 47, no. 3 (gruodžio 1, 1998): 22–38. žiūrėta vasario 1, 2026. https://www.journals.vu.lt/kalbotyra/article/view/31389.