Gaya APA
Das, Braja M. (1990).
Principles of foundation engineering (Ed.2).
Boston:
PWS-KENT.
Gaya Chicago
Das, Braja M.
Principles of foundation engineering.
Ed.2
Boston:
PWS-KENT,
1990.
Text.
Gaya MLA
Das, Braja M.
Principles of foundation engineering.
Ed.2
Boston:
PWS-KENT,
1990.
Text.
Gaya Turabian
Das, Braja M.
Principles of foundation engineering.
Ed.2
Boston:
PWS-KENT,
1990.
Print.