Citazione Stile APA (7a Edizione)

Holtz, W. G. (1969). Soil as an engineering material. United States Department of the Interior.

Citazione stile Chigago Style (17a edizione)

Holtz, Wesley G. Soil as an Engineering Material. Washington, D.C: United States Department of the Interior, 1969.

Citatione MLA (9a ed.)

Holtz, Wesley G. Soil as an Engineering Material. United States Department of the Interior, 1969.