CRAIG R,F, & CRAIG R,F. (1992). Soil Mechanics R.f. Craig. Chapman And Hall.
Lua i Stíl Chicago (17ú heag.)CRAIG R,F, agus CRAIG R,F. Soil Mechanics R.f. Craig. Chapman And Hall, 1992.
Lua MLA (8ú heag.)CRAIG R,F, agus CRAIG R,F. Soil Mechanics R.f. Craig. Chapman And Hall, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.