Gaya APA

Materials, A, S, F, T, A. (2009). ASTM E1820 – 11: Standard Test Method for Measurement of Fracture Toughness (-). Pensylvania: ASTM International.

Gaya MLA

Materials, American, Society, For, Testing, And. "ASTM E1820 – 11: Standard Test Method for Measurement of Fracture Toughness". - Pensylvania: ASTM International, 2009. Book.