Gaya APA
Das, B, M.
(2010).
Principles of Geotechnical Engineering
(
ed. 7)
.
Stamford, ct:
Cengage Learning.
Gaya MLA
Das, Braja, M..
"Principles of Geotechnical Engineering".
ed. 7
Stamford, ct:
Cengage Learning,
2010.
e-book.