Gaya APA
Principles of Foundation Engineering. (1999).
California:
PWS Publishing.
Gaya Chicago
Principles of Foundation Engineering.
Ed.4.
California:
PWS Publishing,
1999.
.
Gaya MLA
Principles of Foundation Engineering.
Ed.4.
California:
PWS Publishing,
1999.
.
Gaya Turabian
Principles of Foundation Engineering.
California:
PWS Publishing,
1999.
.