Schweingruber, F. H., & Häfliger, M. (2007). Tree-ring measurements of Picea glauca (White spruce) from sample SIMPSPLA-232. PANGAEA.
Cita Chicago Style (17a ed.)Schweingruber, Fritz Hans, y Martin Häfliger. Tree-ring Measurements of Picea Glauca (White Spruce) from Sample SIMPSPLA-232. PANGAEA, 2007.
Cita MLA (9a ed.)Schweingruber, Fritz Hans, y Martin Häfliger. Tree-ring Measurements of Picea Glauca (White Spruce) from Sample SIMPSPLA-232. PANGAEA, 2007.
Precaución: Estas citas no son 100% exactas.