Cita APA (7a ed.)

Schweingruber, F. H., & Brunner, M. (2007). Tree-ring measurements of Picea glauca (White spruce) from sample SMITH-121. PANGAEA.

Cita Chicago Style (17a ed.)

Schweingruber, Fritz Hans, y Margrit Brunner. Tree-ring Measurements of Picea Glauca (White Spruce) from Sample SMITH-121. PANGAEA, 2007.

Cita MLA (9a ed.)

Schweingruber, Fritz Hans, y Margrit Brunner. Tree-ring Measurements of Picea Glauca (White Spruce) from Sample SMITH-121. PANGAEA, 2007.