Nilsson, C. (1991). Preheating of ambient air by a system of earth tubes as a heat source for buildings. Chalmers Tekniska Högskola.
Chicago-Zitierstil (17. Ausg.)Nilsson, Carl-Eric. Preheating of Ambient Air by a System of Earth Tubes as a Heat Source for Buildings. Göteborg: Chalmers Tekniska Högskola, 1991.
MLA-Zitierstil (9. Ausg.)Nilsson, Carl-Eric. Preheating of Ambient Air by a System of Earth Tubes as a Heat Source for Buildings. Chalmers Tekniska Högskola, 1991.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.