APA (7th ed.) Citation

Norway spruce (Picea excelsa). [publisher not identified.

Chicago Style (17th ed.) Citation

Norway Spruce (Picea Excelsa). Washington, D.C.: [publisher not identified.

MLA (9th ed.) Citation

Norway Spruce (Picea Excelsa). [publisher not identified.

Warning: These citations may not always be 100% accurate.