APA (7th ed.) Citation

Schweingruber, F. H., & Ziegler, R. (2007). Tree-ring measurements of Picea mariana (Black spruce) from sample SCHEFPMA-21. PANGAEA.

Chicago Style (17th ed.) Citation

Schweingruber, Fritz Hans, and Ruth Ziegler. Tree-ring Measurements of Picea Mariana (Black Spruce) from Sample SCHEFPMA-21. PANGAEA, 2007.

MLA (9th ed.) Citation

Schweingruber, Fritz Hans, and Ruth Ziegler. Tree-ring Measurements of Picea Mariana (Black Spruce) from Sample SCHEFPMA-21. PANGAEA, 2007.

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