APA-referens (7:e uppl.)

Karol, R. H. (1955). Engineering properties of soils. Prentice-Hall.

Chicago-referens (17:e uppl.)

Karol, Reuben Hirsh. Engineering Properties of Soils. New york: Prentice-Hall, 1955.

MLA-referens (9:e uppl.)

Karol, Reuben Hirsh. Engineering Properties of Soils. Prentice-Hall, 1955.