3 literature references:

Author: Farjon, A.
Year: 2005
Title: A monograph of Cupressaceae and Sciadopitys
Source: Royal Botanic Gardens, Kew
Author: Burns, R.M. & Honkala, B.H.
Year: 1990
Title: Silvics of North America. Vol. 1. Conifers (Agriculture Handbook 654)
Source: USDA Forest Service, Washington, D.C.
Author: Farjon, A.
Year: 2010
Title: A Handbook of the World's Conifers
Source: E.J. Brill, Leiden