Torge, W. (1989). Gravimetry. W. de Gruyter.
Lua i Stíl Chicago (17ú heag.)Torge, Wolfgang. Gravimetry. Berlin: W. de Gruyter, 1989.
Lua MLA (9ú heag.)Torge, Wolfgang. Gravimetry. W. de Gruyter, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.