Cita APA (7a ed.)

Schweingruber, F. H., & Ziegler, R. (2007). Tree-ring measurements of Picea mariana (Black spruce) from sample SCHEFPMA-101. PANGAEA.

Cita Chicago Style (17a ed.)

Schweingruber, Fritz Hans, y Ruth Ziegler. Tree-ring Measurements of Picea Mariana (Black Spruce) from Sample SCHEFPMA-101. PANGAEA, 2007.

Cita MLA (9a ed.)

Schweingruber, Fritz Hans, y Ruth Ziegler. Tree-ring Measurements of Picea Mariana (Black Spruce) from Sample SCHEFPMA-101. PANGAEA, 2007.