- Christianity After Communism: Social, Political, and Cultural Struggle in Russia
- Sports, Body and Health
- The layman looks at world religions by Niels Christian Nielsen, 1962
- Body, Sport and Society in Norden: Essays in Cultural History
- Die Gammafunktion (AMS Chelsea Publishing) by Niels Nielsen, 2005-06-26
- Handbuch Der Theorie Der Gammafuntion by Niels Nielsen, 1906
- Krigen pa Karafal by Niels Erik Nielsen, 1981
- Solzhenitsyn's religion by Niels Christian Nielsen; Niels C Nielsen, 1976
- Individual and environment;: A psychiatric-psychological investigation of monozygotic twins reared apart (Acta psychiatrica Scandinavica) by Niels Juel-Nielsen, 1965
- Fra Robin Hood til fodbold: En kulturanalytisk studie i arbejderklassens kropskultur i England i 1800-tallet (Odense University studies in history and social siences) by Niels Kayser Nielsen, 1992
- Outline of English Pronunciation by Niels Davidsen-Nielsen, 2000-12
- The crisis of human rights by Niels Christian Nielsen, 1978
- Solzhenitsyn's religion by Niels Christian Nielsen, 1975
- Fundamentalism, Mythos, and World Religions by Niels C., Jr. Nielsen, 1993-10
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