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2. Permian palynomorphs from the number 5 seam, Ecca Group, Witbank / Highveld Coalfields, South Africa;Aitken;Palaeontol. Afr.,1994
3. Standard Test Methods for Proximate Analysis of Coal and Coke by Macro Thermogravimetric Analysis;ASTM D7582–15,2015
4. Fossil in situ spores and pollen grains: an annotated catalogue;Balme;Rev. Palaeobot. Palynol.,1995
5. Palynostratigraphic correlation of the Springbok Flats Coalfield to other coal-bearing successions in the Karoo basins of southern Africa;Barbolini;S. Afr. J. Coal Geol.,2018