Gaya APA
Penzien, R, W, C, J.
(1993).
Dymanics Of Structures
(
2)
.
Singaore:
McGaw-Hill Book co.
Gaya MLA
Penzien, Ray, W., Clough,, Joseph.
"Dymanics Of Structures".
2
Singaore:
McGaw-Hill Book co,
1993.
Text.