B. Bemer, SIMULA, an ALGOL Offspring --First Object-Oriented Programming Language; in Bob Bemer's Computer History Vignettes, www.bobbemer.com/SIMULA.HTM; Last accessed, 2010.

V. Jan, Garwick in Memoriam, pp.576-576, 1989.

O. Dahl and K. Nygaard, The Development of the Simula Languages History of Programming Languages, 1981.

K. Elgsaas and H. Hegna, The Norwegian Computing Center and the Univac 1107 (1963???1970), History of Nordic Computing: IFIP WG 9.7 First Working Conference on the History of Nordic Computing (HiNC1), 2003.
DOI : 10.1007/0-387-24168-X_39

K. Elgsaas and H. Hegna, The Development of Computer Policies in Government, Political Parties, and Trade Unions in Norway, History of Nordic Computing 2: IFIP WG 9.7 Second Working Conference on the History of Nordic Computing (HiNC2), 1961.

A. Fjuk, A. Karahasanovic, and J. Kaasbøll, Comprehensive object-oriented Learning.: the Learner's Perspective (COOL), Informing Science, 2006.

C. Floyd, Out of Scandinavia: Alternative Approaches to Software Design and System Development, Human-Computer Interaction, vol.28, issue.3, pp.253-350, 1989.
DOI : 10.1016/0165-6074(85)90032-8

E. Holbaek-hanssen, P. Håndlykken, and K. Nygaard, System Description and the DELTA Language; DELTA Project Rep, 1975.

J. R. Holmevik, Compiling SIMULA: a historical study of technological genesis, IEEE Annals of the History of Computing, vol.16, issue.4, pp.25-37, 1994.
DOI : 10.1109/85.329756

S. Krogdahl, The Birth of Simula, History of Nordic Computing: IFIP WG 9.7 First Working Conference on the History of Nordic Computing (HiNC1), 2003.
DOI : 10.1007/0-387-24168-X_24

L. Madsen, O. Møller-pedersen, B. Nygaard, and K. , Object-Oriented Programming in the BETA Programming Language, 1993.

B. Møller-pedersen, Ø. Haugen, and F. Belina, Object-Oriented SDL. Tele (Swedish Televerket's technical journal, 1991.

. Norsk-matematisk-tidsskrift, ); Resultatet av premiekonkurransen for gymnasiaster, 1945.

K. Nygaard and O. Bergo, Planlegging, styring og databehandling. Grunnbok for fagbevegelsen (Planning, Control and Data Processing, Basic Reader for Trade Unions

K. Nygaard, The Iron and Metal Project Trade Union Participation, Proceedings of the CREST Conference on Management Information Systems, 1977.

K. Nygaard, Program development as a social activity, Proceedings from the IFIP 10th World Computer Congress, 1986.

K. Nygaard, Those were the days. Or Heroic times are here again? " ; Opening lecture at The Information Systems Research in Scandinavia (IRIS) Conference, In Scandinavian Journal of Information Systems, vol.8, issue.2, pp.91-108, 1996.

K. Nygaard, GOODS to appear on the stage, European Conference on Object-Oriented Programming, 1997.
DOI : 10.1007/BFb0053372

K. Nygaard, Home page, 2010.

M. Nygaard, L. Böszörmenyi, and S. Podlipnig, Notes on Kristen Nygaard's early years and his political work, -printed for 18th European Conference on Object-Oriented Programming, 2003.

K. Nygaard, Profession Oriented Languages; In SYDPOL Program working group 2: Computers and language at work: the relevance of language and language use in development of computer systems, 1989.

K. Nygaard, We are not against Europe, we are against Norwegian membership in the European Union; Lecture at " Europa Fluch oder Segen? " Münichhtml; Last accessed, POLITIKKDOK_MAPPE/P_EU_Munchen_eng, 1995.