1. Tan Yean-Chin and Chow Chee-Ming. 2014. “Foundation Design and Construction in Limestone Formation: A Malaysian Consultant’s Experience”. Advances in Foundation Engineering. Research Publishing Services.
2. Ibrahim, O.B. & Fang, H.T. 1985. Piled foundation in limestone formation. In: Proceedings of the 8th Southeast Asian Geotechnical Conference, Kuala Lumpur, 11–15 March, 1985, 1. Kuala Lumpur: Organising Committee, 1985, P4/45 - P4/52.
3. Raj, J.K., Tan, D. N. K. & Wan Hasiah Abdullah 2009. Cenozoic Stratigraphy. In Hutchison, C. S. & Tan, D. N. K. (eds.) Geology of Peninsular Malaysia. Universiti Malaya and Geological Society of Malaysia Publication, Kuala Lumpur, 133–173.
4. Foo K.Y., 1990. Geology and Mineral Resources of The Taiping-Kuala Kangsar Area, Perak Darul Ridzuan. Geol. Survey Malaysia, Map Rept. 1, 145p.
5. Metcalfe, I. 1981. Permian and Early Triassic conodonts from northwest Malaya. Fourth. Reg. Conf. Geol. Min. Res. S.E. Asia, Abstracts of Papers, p. 10.