1. Acres , B. D. Bow , R. P. Burrough , P. A. Folland , C. J. Kalsi , M. S. Thomas , P. Wright , P. S. 1975 The Soils of Sabah. Land Resource Study No. 20, Land Resources Division, Ministry of Overseas Development, London
2. Bower , R. Burrough , P. A. Kalsi , M. S. Thomas , P. 1975 4 South Western Districts Acres et al.
3. Collenette , P. 1958 Geology and mineral resources of the Jesselton-Kinabalu area, North Borneo Brit. Borneo Geol. Survey Mem. 6. Govt. Printer, Sarawak
4. Collenette , P. 1965 The geology and mineral resources of the Pensiangan and upper Kinabatangan area, Sabah, Malaysia Mem. geol. Survey Borneo Reg. Malaysia No. 12
5. Eswaran , H. 1972 A micromorphological study of some B horizons from Sabah, Malaysia. 16th Dec. Geological Inst. Univ. Gent. Mimeo 21