Gaya APA
liu, C., b.evert, J. (1997).
Soil Properties Testing, Measurement, And Evaluation (third).
united states of AMERICA:
Prentice Hall.
Gaya MLA
liu, Cheng., b.evert, Jack.
"Soil Properties Testing, Measurement, And Evaluation".
third
united states of AMERICA:
Prentice Hall,
1997.
Text.