References
- C. Michael Hogan. 2008. Black Spruce: Picea mariana, GlobalTwitcher.com, ed. Nicklas Stromberg
- Pat Diehl Scace. 2001. The Floral Artist's Guide: A Reference to Cut Flowers and Foliages, published by Cengage Learning, ISBN 0-7668-1572-2, ISBN 978-0-7668-1572-8 264 pages
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