He wrote several books, among them the controversial memoir "...slik jeg ser det" ("...the way I see it", 1975), in which he strongly attacked Gerhardsen. He also wrote a two-volume biography of his mentor Martin Tranmæl, "Et bål av vilje" and "Veiviseren" ("A Beacon of Resolve", 1988 and "The Pathfinder", 1991). In his latest book, released in 2008 at 103 years of age, being traditionally a strong proponent of cooperation with the United States, he called for enhanced security cooperation between the Nordic countries and argued Norway should buy the Swedish JAS Gripen aircraft instead of the US-made Joint Strike Fighter.