Gaya APA

Sowers, G, F. (1870). Introductory Soil Mechanics and Fondations : Geotechnical Engineering (Edisi Keempat). United State of America: Macmilan Publishing.

Gaya MLA

Sowers, George, F. "Introductory Soil Mechanics and Fondations : Geotechnical Engineering". Edisi Keempat United State of America: Macmilan Publishing, 1870. Text.