Gaya APA

Handy, R, L., Spangler, M, G. (2007). Geotechnical engineering: soil and foundation principles and practice (5th ed.). USA: McGraw-Hill Higher Education.

Gaya MLA

Handy, Richard, L.., Spangler, M., G.. "Geotechnical engineering: soil and foundation principles and practice". 5th ed. USA: McGraw-Hill Higher Education, 2007. Text.