Gaya APA

Swanson, C, P., Sanglerat, G. (1972). The penetrometer and soil exploration interpretation of penetration ì diagrams-theory and practice . Amsterdam: Amsterdam: Elsevier; 1972.

Gaya MLA

Swanson, Carl, P.., Sanglerat, G.. "The penetrometer and soil exploration interpretation of penetration ì diagrams-theory and practice". Amsterdam: Amsterdam: Elsevier; 1972, 1972. Text.