Gaya APA

DS, A. (2011). The influence of rock properties and size into strength criteria: a proposed criterion for rock mass . Surabaya: Petra Christian University Surabaya.

Gaya MLA

DS, Agustawijaya. "The influence of rock properties and size into strength criteria: a proposed criterion for rock mass". Surabaya: Petra Christian University Surabaya, 2011. Artikel.