For Thuja
Chambers, K.L. 1993. Thuja. In Flora of North America Editorial Committee. 1993b. Flora of North America north of Mexico. Volume 2, pteridophytes and gymnosperms. Oxford Univ. Press, New York, NY. 475 pp.
Li, J., Y. Zhang, M. Ruhsam, R.I. Milne, Y. Wang, D. Wu, S. Jia, T. Tao, and K. Mao. 2022. Seeing through the hedge: phylogenomics of Thuja (Cupressaceae) reveals prominent incomplete lineage sorting and ancient introgression for Tertiary relict flora. Cladistics 38: 187-203
Page. 1990. In Kramer, K.U., and P.S. Green. 1990. Pteridophytes and Gymnosperms. In K. Kubitzki, ed., The families and genera of vascular plants. Springer-Verlag, Berlin.
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