Gw mau tau Rujukan dari Formasi Tangga. Jelasin dalam bahasa melayu

Jones, C.R., 1981. Geology and mineral resources of the Perlis, North Kedah and the Langkawi Islands. Geological Survey Department West Malaysia Memoir, 17, 257p.

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.