Mauk, Ronald L.; Henderson, Jan A. (1984). "Coniferous Forest Habitat Types of Northern Utah". USDA Forest Service General Technical Report (INT-170). Ogden, Utah: Intermountain Forest and Range Experiment Station: 31–32. Retrieved 9 October 2024.
Jones 1973, p. 47. Jones, John R. (1973). "Southwestern Mixed Conifers". Silvicultural systems for the Major Forest Types of the United States. Agriculture Handbook No. 445 (First ed.). Washington, D.C.: U.S. Department of Agriculture. p. 47. Retrieved 5 October 2024.
Johnson 2014, p. 2. Johnson, David W. (2014). "Picea pungens". In Stimm, Bernd; Roloff, Andreas; Lang, Ulla M.; Weisgerber, Horst (eds.). Enzyklopädie der Holzgewächse: Handbuch und Atlas der Dendrologie [Encyclopedia of Woody Plants: Handbook and Atlas of Dendrology] (in German). Weinheim, Germany: Wiley. pp. 1–8. doi:10.1002/9783527678518. ISBN978-3-527678518. OCLC900416230.
Gilman, Edward F.; Watson, Dennis G. (2011-05-01). "Picea pungens: Colorado Spruce". EDIS. IFAS Extension Service: University of Florida. Retrieved 2013-10-06.
Stuart & Sawyer 2001, p. 31–32. Stuart, John David; Sawyer, John O. (2001). Trees and Shrubs of California. Illustrated by Andrea J. Pickart (First ed.). Berkeley, California: University of California Press. pp. 31–32. ISBN978-0-520-22109-3. OCLC44267780.
Sjöman & Anderson 2023, p. 161–163. Sjöman, Henrik; Anderson, Arit (2023). The Essential Tree Selection Guide: For Climate Resilience, Carbon Storage, Species Diversity and Other Ecosystem Benefits (First ed.). Bath, England: Filbert Press. pp. 161–163. ISBN978-1-7399039-4-7. OCLC1400102923.
Ackerfield 2015, p. 61. Ackerfield, Jennifer (2015). Lipscomb (ed.). Flora of Colorado (First ed.). Fort Worth, Texas: Botanical Research Institute of Texas. p. 61. ISBN978-1-889878-45-4. OCLC910162216.
Johnson 2014, p. 2. Johnson, David W. (2014). "Picea pungens". In Stimm, Bernd; Roloff, Andreas; Lang, Ulla M.; Weisgerber, Horst (eds.). Enzyklopädie der Holzgewächse: Handbuch und Atlas der Dendrologie [Encyclopedia of Woody Plants: Handbook and Atlas of Dendrology] (in German). Weinheim, Germany: Wiley. pp. 1–8. doi:10.1002/9783527678518. ISBN978-3-527678518. OCLC900416230.