Gaya APA
Hardiyatmo, H, C.
(2007).
Mekanika Tanah II
(
4)
.
Yogykarta:
UGM.
Gaya MLA
Hardiyatmo, Hary, Christady.
"Mekanika Tanah II".
4
Yogykarta:
UGM,
2007.
Text.