Schweingruber, F. H., & Ziegler, R. (2007). Tree-ring measurements of Picea mariana (Black spruce) from sample SCHEFPMA-22. PANGAEA.
Citazione stile Chigago Style (17a edizione)Schweingruber, Fritz Hans, e Ruth Ziegler. Tree-ring Measurements of Picea Mariana (Black Spruce) from Sample SCHEFPMA-22. PANGAEA, 2007.
Citatione MLA (9a ed.)Schweingruber, Fritz Hans, e Ruth Ziegler. Tree-ring Measurements of Picea Mariana (Black Spruce) from Sample SCHEFPMA-22. PANGAEA, 2007.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.