Karol, R. H. (1955). Engineering properties of soils. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Karol, Reuben Hirsh. Engineering Properties of Soils. New york: Prentice-Hall, 1955.
Lua MLA (9ú heag.)Karol, Reuben Hirsh. Engineering Properties of Soils. Prentice-Hall, 1955.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.