És autor d'obres com ara Colloquial Romanian (1984),[3]Ceauşescu and the Securitate: Coercion and Dissent in Romania, 1965-1989 (1995),[4]Communist Terror in Romania: Gheorghiu-Dej and the Police State 1948–1965 (1999),[5][6]Security Intelligence Services in New Democracies: The Czech Republic, Slovakia and Romania (2001), junto a Kieran Williams,[7] o Hitler's Forgotten Ally: Ion Antonescu and His Regime, Romania 1940–1944 (2006), sobre el dictador romanès Ion Antonescu,[1][8][9][10] entre d'altres. També ha estat editor de Historians as Nation-Builders: Central and South-East Europe (1988), conjuntament amb Harry Hanak.[11]
Auty, Phyllis «Historians as Nation-Builders: Central and South-East Europe by Dennis Deletant; Harry Hanak» (en anglès). The International History Review. Taylor & Francis, Ltd., 12, 2, 5-1990, pàg. 385-387. ISSN: 0707-5332. JSTOR: 40106200.
Betts, Paul «Hitler's Forgotten Ally: Ion Antonescu and His Regime, Romania 1940-1944 by Dennis Deletant» (en anglès). The Slavonic and East European Review. Modern Humanities Research Association, 86, 3, 7-2008, pàg. 569-571. ISSN: 2222-4327. JSTOR: 25479245.
Carlton, Charles M. «Colloquial Romanian by Dennis Deletant». The Modern Language Journal. Wiley, 68, 3, 1984, pàg. 300-301. DOI: 10.2307/328044. ISSN: 1540-4781. JSTOR: 328044.
Fischer, Mary Ellen «Communist Terror in Romania: Gheorghiu-Dej and the Police State, 1948-1965 (review)» (en anglès). Journal of Cold War Studies. MIT Press, 5, 3, 2003, pàg. 152-154. ISSN: 1531-3298.
Gill, Peter «Security Intelligence Services in New Democracies: The Czech Republic, Slovakia and Romania by Kieran Williams; Dennis Deletant» (en anglès). Slavic Review. Association for Slavic, East European, and Eurasian Studies, 61, 2, 2002, pàg. 375-376. ISSN: 0037-6779. JSTOR: 2697133.
Hitchins, Keith «Dennis Deletant. Communist Terror in Romania: Gheorghiu-Dej and the Police State 1948–1965. New York: St. Martin's. 1999. Pp. xii, 351» (en anglès). The American Historical Review. American Historical Association, 106, 3, 2001, pàg. 1087-1088. DOI: 10.1086/ahr/106.3.1087. ISSN: 1937-5239.
Kellogg, Frederick «Ceauşescu and the Securitate: Coercion and Dissent in Romania, 1965-1989 by Dennis Deletant» (en anglès). Slavic Review. Association for Slavic, East European, and Eurasian Studies, 58, 2, 1999, pàg. 471-472. ISSN: 0037-6779. JSTOR: 2673100.
Pennell, Daniel M. «Hitler's Forgotten Ally: Ion Antonescu and His Regime, Romania 1940-1944 by Dennis Deletant» (en anglès). Shofar. Purdue University Press, 27, 4, 2009, pàg. 175-177. ISSN: 0882-8539. JSTOR: 42944809.