1. Little, A. (1969, January 15–18). The engineering classification of residual tropical soils. Proceedings of the 7th International Conference on Soil Mechanics and Foundation Engineering, Mexico City, Mexico.
2. Tamado, D. (2024). Evaluasi Kondisi Geologi Teknik dan Analisis Kestabilan Zona Portal Terowongan Jalan Tol Yogyakarta-Bawen Seksi 5 Jalur Temanggung-Ambarawa. Evaluation of Engineering Geological Conditions and Stability Analysis of the Portal Zone of the Yogyakarta-Bawen Toll Road Tunnel Section 5 Temanggung-Ambarawa Line. [Master’s Thesis, Universitas Gadjah Mada].
3. Younger, J.S., and Cook, J.R. (1994, January 5–10). The impact of characteristics of Indonesian tropical soils on construction. Proceedings of the XIII ICSMFE, New Delhi, India.
4. Liu, R., Chi, Y., Xie, Y., Kang, C., Sun, L., Wu, P., and Wei, Z. (2024). Characteristics and influencing factors of the granite weathering profile: A case study of a high latitude area in Northeastern China. Minerals, 14.
5. Blight, G., and Leong, E. (2012). Shear strength behaviour and the measurement of shear strength in residual soils. Mechanics of Residual Soils, CRC Press. [2nd ed.].