Schweingruber, F. H. (2007). Tree-ring chronology of Picea abies (Norway spruce) compiled from tree samples PAV. PANGAEA.
Citazione stile Chigago Style (17a edizione)Schweingruber, Fritz Hans. Tree-ring Chronology of Picea Abies (Norway Spruce) Compiled from Tree Samples PAV. PANGAEA, 2007.
Citatione MLA (9a ed.)Schweingruber, Fritz Hans. Tree-ring Chronology of Picea Abies (Norway Spruce) Compiled from Tree Samples PAV. PANGAEA, 2007.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.