Christenhusz, M. J. M., Reveal, J. L., Farjon, A., Gardner, M. F., Mill, R. R., & Chase, M. W. (2011). A new classification and linear sequence of extant gymnosperms. Phytotaxa, 19(1), 55–70. https://doi.org/10.11646/phytotaxa.19.1.3