Gaya APA
Bowles, J, E., Silaban, P.
(1991).
Analisis dan desain pondasi
(
4th ed)
.
Jakarta:
Penerbit Erlangga.
Gaya MLA
Bowles, Joseph, E.., Silaban, Pantur..
"Analisis dan desain pondasi".
4th ed
Jakarta:
Penerbit Erlangga,
1991.
Printed Book.