Watson, Joan; Lydon, Susannah J (2004). "The bennettitalean trunk genera Cycadeoidea and Monanthesia in the Purbeck, Wealden and Lower Greensand of southern England: A reassessment". Cretaceous Research. 25: 1–26. doi:10.1016/j.cretres.2003.10.003.
Rothwell, G. W.; Stockey, R. A. (2002). "Anatomically preserved Cycadeoidea (Cycadeoidaceae), with a reevaluation of systematic characters for the seed cones of Bennettitales". American Journal of Botany. 89 (9): 1447–1458. doi:10.3732/ajb.89.9.1447. PMID21665746.
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pubmed.ncbi.nlm.nih.gov
Rothwell, G. W.; Stockey, R. A. (2002). "Anatomically preserved Cycadeoidea (Cycadeoidaceae), with a reevaluation of systematic characters for the seed cones of Bennettitales". American Journal of Botany. 89 (9): 1447–1458. doi:10.3732/ajb.89.9.1447. PMID21665746.
