1. C. S. Calude. Information and Randomness - An Algorithmic Perspective. 2nd Edition, Revised and Extended, Springer-Verlag, Berlin, 2002, 485 pp.

2. C. S. Calude, G. Paun. Computing with Cells and Atoms, Taylor & Francis Publishers, London, 2001, 336 pp.

3. C. S. Calude. Constructive Mathematics, Ed. stiintifica, Bucharest, 1995, 123 pp. (in Romanian)

4. C. Calude. Information and Randomness - An Algorithmic Perspective, EATCS Monographs in Theoretical Computer Science 1, Springer-Verlag, Berlin, Heidelberg, New York, London, Paris, Tokyo, Hong Kong, Barcelona, Budapest, 1994, 254 pp. (MR 96d: 68103, Zbl 950# 09877)

5. C. Calude. Theories of Computational Complexity, Annals of Discrete Mathematics 35, North-Holland, Amsterdam, New York, Oxford, Tokyo, 1988, 500 pp. (MR 89g: 03057, Zbl 633#03034)

6. C. Calude. Computational Complexity. Qualitative Aspects, Ed. stiintifica si enciclopedica, Bucharest, 1982, 300 pp. (in Romanian) (Zbl 619#03029)

7. C. Calude. True, but Unprovable, Ed. stiintifica si enciclopedica, Bucharest, 1988, 110 pp. (in Romanian) (Zbl 654#03001)

8. C. Calude, Gh. Paun. The Mathematical Model: Tool and Viewpoint, Ed. stiintifica si enciclopedica, Bucharest, 1982, 140 pp. (in Romanian)

9. C. Calude. What Are the Programming Languages ?, Ed. stiintifica si enciclopedica, Bucharest, 1978, 100 pp. (in Romanian)