Gaya APA
BOWLES, J, E.
(1988).
foundation analysis and design (4 edition)
(
4)
.
SINGAPORE:
Mc Graw Hill.
Gaya MLA
BOWLES, JOSEPH, E..
"foundation analysis and design (4 edition)".
4
SINGAPORE:
Mc Graw Hill,
1988.
Text Book Sipil.