Manum, S.B. 1983. 13th Sir Albert Charles Seward Memorial Lecture: Palynology, Organic Petrology and Petroleum - A Palaeobotanists View. Journal of Palaeosciences. 31, (1-3) (Dec. 1983), 100–107. DOI:https://doi.org/10.54991/jop.1983.1712.