Gaya APA
Biggs, J, M. (1964).
(TEKNIK SIPIL 1) Introduction to Structural Dynamics (1).
United State of America:
McGraw- Hill.
Gaya MLA
Biggs, John, M,.
"(TEKNIK SIPIL 1) Introduction to Structural Dynamics".
1
United State of America:
McGraw- Hill,
1964.
.