Schweingruber, F. H., & Kienast, F. (2007). Tree-ring measurements of Picea abies (Norway spruce) from sample PRE-72. PANGAEA.
Citazione stile Chigago Style (17a edizione)Schweingruber, Fritz Hans, e Felix Kienast. Tree-ring Measurements of Picea Abies (Norway Spruce) from Sample PRE-72. PANGAEA, 2007.
Citatione MLA (9a ed.)Schweingruber, Fritz Hans, e Felix Kienast. Tree-ring Measurements of Picea Abies (Norway Spruce) from Sample PRE-72. PANGAEA, 2007.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.