Coba jelasin Rujukan dari Formasi Simpang dalam bahasa melayu dong

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Suntharalingam, T dan Teoh, L.H., 1985. Quaternary geology of the coastal plain of Taiping, Perak. Geol. Suv. Malaysia Quaternary Geology Bulletin 1, 64 pp.

Walker, D., 1956. Studies in the Quaternary of the Malay Peninsula, 1. Alluvial deposits of Perak and changes in the relative levels of land and sea. Fed. Mus. J., 1&2, pp.19-34.

The Malaysia-Thailand Border Joint Geological Survey Committee (MT-JGSC), 2006. Geology of the Batu Melintang - Sungai Kolok transect area along the Malaysia - Thailand border. Minerals and Geoscience Department Malaysia.

The Malaysia-Thailand Border Joint Geological Survey Committee (MT-JGSC), 2009. Geology of the Bukit Batu Putih - Satun transect area along the Malaysia - Thailand border. Minerals and Geoscience Department Malaysia.