2 literature references:

Author: Lemmens, R.H.M.J. et al. (eds.)
Year: 1995
Title: PROSEA No. 5 (2). Timber trees: Minor commercial timbers
Source: Backhuys Publishers, Leiden
Author: Farjon, A.
Year: 2010
Title: A Handbook of the World's Conifers
Source: E.J. Brill, Leiden