Köhnlein, W. (1988). A model of the ionosphere in the altitude interval 50-4000 km. DFVLR.
Lua i Stíl Chicago (17ú heag.)Köhnlein, Walter. A Model of the Ionosphere in the Altitude Interval 50-4000 Km. Koln: DFVLR, 1988.
Lua MLA (8ú heag.)Köhnlein, Walter. A Model of the Ionosphere in the Altitude Interval 50-4000 Km. DFVLR, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.