1. Lycopod fructifications from the Upper Freeport No. 7 in Southeast Ohio;Abbott;Palaeontographica B,1963
2. The structure and development of the peat swamps of Sarawak and Brunei;Anderson;Journal of Tropical Geography,1964
3. Palynological study of a holocene peat and a miocene coal deposit from NW Borneo
4. Butterworth M. A. (1977) in The 139th Annual Meeting of the British Association for the Advancement of Science Palynology and Coal (University of Aston).