RAHN, P. H. Engineering Geology#an environmental approach#Perry H. Rahn. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)RAHN, Perry H. Engineering Geology#an Environmental Approach#Perry H. Rahn. Prentice Hall.
Lua MLA (8ú heag.)RAHN, Perry H. Engineering Geology#an Environmental Approach#Perry H. Rahn. Prentice Hall.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.