ANDERSON, John Malcolm; ANDERSON, Heidi M.; CLEAL, Christopher J.. Brief history of the gymnosperms (classification, biodiversity, phytogeography and ecology). [s.l.] : South African National Biodiversity Institute, 2007. 280 s. Dostupné online.ISBN 978-1-919976-39-6. S. 6.
ANDERSON, J. M., ANDERSON, H. M.: Heyday of the Gymnosperms: systematics and biodiversity of the Late Triassic Molteno fructifications, 2003, S. 19 [1]
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TAYLOR, Thomas N.; TAYLOR, Edith L.; KRINGS, Michael. Paleobotany : the biology and evolution of fossil plants. 2nd ed. London : Academic Press, 2009. Dostupné online.ISBN 978-0-12-373972-8. S. 1028.
