. Smithsonian National Air and Space Museum. 2016-04-28. คลังข้อมูลเก่า เก็บจาก แหล่งเดิม เมื่อ 5 April 2004. สืบค้นเมื่อ 21 August 2016.
"Picea Genus (spruce)". American Conifer Society. American Conifer Society. สืบค้นเมื่อ 13 June 2019.
"Tree Book - Sitka spruce (Picea sitchensis)". British Columbia Ministry of Forests, Lands and Natural Resource Operations. สืบค้นเมื่อ 29 July 2006.
Crellin, J. K. (2004). A social history of medicines in the twentieth century: to be taken three times a day. New York: Pharmaceutical Products Press. p. 39. ISBN978-0789018441.
Stubbs, Brett J. (June 2003). "Captain Cook's beer: the antiscorbutic use of malt and beer in late 18th century sea voyages". Asia Pacific Journal of Clinical Nutrition. 12 (2): 129–137. PMID 12810402.
แหล่งข้อมูลอื่น
theplantlist.org / Picea (Spruce)
conifers.org / Gymnosperm Database - Picea
efloras.org / Picea
pinetum.org / Arboretum de Villardebelle: Cones of selected species of Picea: page 1, Arboretum de Villardebelle page 2
สิงหาคม 15, 2021
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