[1] - Stefan Ispas, Ionel Lazar: Motorul Turboreactor - istorie, prezent, perspective (Turboreactor engine - history, present, future) Editura Tehnica, Bucuresti, 1991.
[2] - Florin Gheorghita - Enigme in galaxie (Enigma in galaxy), Editura Junimea, Iasi, 1983.
[3] - Dan Apostol - Deocamdata ... enigme (Enigma ...for the moment), ed. 2, Editura Sport - Turism, Bucuresti, 1986.
[4] - Dan D. Farcas - Magazin Saptamanal Cultural Stiintific Independent (Cultural Scientific Independent Weekly Magazine), Nr. 43(2190) din 28 oct. 1999.
[5] - N. Alexandru - Revista Fenomenelor Paranormale si de Astrologie (Paranormal Phenomenon  and Astrology Magazine), Nr. 30 din 25-31 oct. 1999.