Gaya APA
Materials, A, S, O, T. (2012).
ASTM D4403-12 Standard Practice for Extensometers Used in Rock .
America:
ASTM International.
Gaya MLA
Materials, American, Society, Of, Testing.
"ASTM D4403-12 Standard Practice for Extensometers Used in Rock".
America:
ASTM International,
2012.
Text.