Petersen 2008, pp. 75–98. The official purpose and size and length of Camp Century tunnels given on p.78. Petersen, Nikolaj (March 2008). "The Iceman That Never Came: 'Project Iceworm', the search for a NATO deterrent, and the Kingdom of Denmark, 1960–1962". Scandinavian Journal of History. 33 (1). doi:10.1080/03468750701449554. S2CID142526881.
Petersen 2008, p. 80 Petersen, Nikolaj (March 2008). "The Iceman That Never Came: 'Project Iceworm', the search for a NATO deterrent, and the Kingdom of Denmark, 1960–1962". Scandinavian Journal of History. 33 (1). doi:10.1080/03468750701449554. S2CID142526881.
Petersen 2008, p. 79 Petersen, Nikolaj (March 2008). "The Iceman That Never Came: 'Project Iceworm', the search for a NATO deterrent, and the Kingdom of Denmark, 1960–1962". Scandinavian Journal of History. 33 (1). doi:10.1080/03468750701449554. S2CID142526881.
Petersen 2008, pp. 75–98. The official purpose and size and length of Camp Century tunnels given on p.78. Petersen, Nikolaj (March 2008). "The Iceman That Never Came: 'Project Iceworm', the search for a NATO deterrent, and the Kingdom of Denmark, 1960–1962". Scandinavian Journal of History. 33 (1). doi:10.1080/03468750701449554. S2CID142526881.
Petersen 2008, p. 80 Petersen, Nikolaj (March 2008). "The Iceman That Never Came: 'Project Iceworm', the search for a NATO deterrent, and the Kingdom of Denmark, 1960–1962". Scandinavian Journal of History. 33 (1). doi:10.1080/03468750701449554. S2CID142526881.
Petersen 2008, p. 79 Petersen, Nikolaj (March 2008). "The Iceman That Never Came: 'Project Iceworm', the search for a NATO deterrent, and the Kingdom of Denmark, 1960–1962". Scandinavian Journal of History. 33 (1). doi:10.1080/03468750701449554. S2CID142526881.