1. C. Calude. Algorithmic Information Theory, Lecture Notes, The University of Western Ontario, London, 1992, 42 pp.
2. C. Calude. Introduction to Computing. Lecture Notes for Mathematics Teachers, Bucharest University, Bucharest, 1988, 42 pp. (in Romanian)
3. C. Calude. Algorithms. Recursiveness, Complexity and Constructivity, Bucharest University, Bucharest, 1987, 197 pp (first edition), 1988, 208 pp (second edition). (in Romanian)
4. C. Calude, V. E. Cazanescu. Introduction to Computing. Mathematical Logic Lecture Notes, Bucharest University, Bucharest, 1984,96 pp. (in Romanian)
5. C. Calude. Introduction to Computing. Laboratory Themes, Bucharest University, Bucharest, 1982, 66 pp. (in Romanian).