Gaya APA
Kusuma, N, H. (1988).
statistics probability and reliability for civil and endvironmrntal engineers .
:
CD,RS.Bethesda.
Gaya MLA
Kusuma, Nugraha, Hadi.
"statistics probability and reliability for civil and endvironmrntal engineers".
:
CD,RS.Bethesda,
1988.
.