Alatas, I. M., Kamaruddin, S. A., Nazir, R., Irsyam, M., & Himawan, A. (2015). Shear strength degradation of Semarang Bawen clay shale due to weathering process. Penerbit UTM Press.

Alatas, Idrus M., Samira Albati Kamaruddin, Ramli Nazir, Masyhur Irsyam, and Agus Himawan. Shear Strength Degradation of Semarang Bawen Clay Shale Due to Weathering Process. Penerbit UTM Press, 2015.

Alatas, Idrus M., et al. Shear Strength Degradation of Semarang Bawen Clay Shale Due to Weathering Process. Penerbit UTM Press, 2015.