Bộ Tuế, tên khoa học Cycadales, là một bộ thực vật có hạt đặc trưng bởi thân gỗ mập mạp với lá cứng thường xanh tạo thành một tán lớn. Chúng thường có lá dạng lông chim.
De Luca, Paulo (1990) "A Historical Perspective on Cycads from Antiquity to the Present", In: Stevenson, D. (Ed.) The Biology, Structure, and Systematics of the Cycadales, Memoirs of the New York Botanical Garden, 57, p. 1-7, ISBN 0-89327-350-3
Donaldson, J. (2004) "Saving ghosts? The implications of taxonomic uncertainty and shifting infrageneric concepts in the cycadales for red listing and conservation planning", In: Walters,T. & Osborne, R. (eds), Cycad Classification: Concepts and Recommendations, Wallingford, UK: CABI, ISBN 0-85199-741-4, p. 13-22.
Golding, J.S.; Hurter, P.J.H. (2003). “A Red List account of Africa's cycads and implications of considering life-history and threats”. Biodiversity and Conservation. 12 (3): 507–528. doi:10.1023/A:1022472801638.
Gonzàlez-Astorga, J.; Vovides, A.P.; Ferrer, M.M.; Iglesias, C. (2003a). “Population genetics of Dioon edule Lindl. (Zamiaceae, Cycadales): biogeographical and evolutionary implications”. Botanical Journal of the Linnean Society. 80 (3): 457–467. doi:10.1046/j.1095-8312.2003.00257.x.
Gonzàlez-Astorga, J.; Vovides, A.P.; Iglesias, C. (2003b). “Morphological and geographic variation in Dioon edule Lindl. (Zamiaceae): ecological and evolutionary implications”. Botanical Journal of the Linnean Society. 141 (4): 465–470. doi:10.1046/j.1095-8339.2003.00155.x.
Gregory, T.J. & Chemnick, J. (2004) Hypotheses of the relationship between biogeography and speciation in Dioon (Zamiaceae). In: Walters,T. & Osborne, R. (eds), Cycad Classification: Concepts and Recommendations, Wallingford, UK: CABI, ISBN 0-85199-741-4, p. 137-148.
Hermsen, E.; Taylor, E.; Taylor, T.; Stevenson, D. (2006). “Cataphylls of the middle Triassic cycad Antarcticycas schopfii and new insights into cycad evolution”. American Journal of Botany. 93 (724–738): 2006.
Hill, C.R. (1990). “Ultrastructure of in situ fossil cycad pollen from the English Jurassic, with a description of the male cone Androstrobus balmei sp. nov”. Review of Palaeobotany and Palynology. 65 (1–4): 165–193. doi:10.1016/0034-6667(90)90067-S.
Hill, K.D. (2004) "Character evolution, species recognition and classification concepts in the cycadaceae", In: Walters,T. & Osborne, R. (eds), Cycad Classification: Concepts and Recommendations, Wallingford, UK: CABI, ISBN 0-85199-741-4, p. 23-44. CABI, Oxford.
Jones, David L. (1993) Cycads of the World, Washington, D.C.: Smithsonian Institution Press, ISBN 1-56098-220-9. 2nd ed. republished (2002) as: Cycads of the World: ancient plants in today's landscape, Sydney: Reed New Holland, ISBN 1-876334-69-X
Norstog, K.J. & Nicholls, T.J. (1998) Biology of Cycads, Ithaca: Cornell University Press, ISBN 0-8014-3033-X
Stevenson, D (1992). “A formal classification of the extant cycads”. Brittonia. 44: 220–223. doi:10.2307/2806837.
Stevenson, D., K. Norstog, & P. Fawcett. 1998. Pollination biology of cycads. In: Reproductive Biology: In systematics, conservation, and economic botany. Eds. S. Owens & P. Rudall. pp. 277–294. Royal Botanic Gardens, Kew.
Walters, T., Osborne, R., & Decker, D. (2004) "We hold these truths…Lưu trữ 2009-02-25 tại Wayback Machine", In: Walters,T. & Osborne, R. (eds), Cycad Classification: Concepts and Recommendations, Wallingford, UK: CABI, ISBN 0-85199-741-4, p. 1-11
Whitelock, L.M. (2002) The Cycads, Portland, OR: Timber Press, ISBN 0-88192-522-5
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