Burkhardt, E. (2009). Whale sightings during POLARSTERN cruise ANT-XXIII/9. PANGAEA.
Citazione stile Chigago Style (17a edizione)Burkhardt, Elke. Whale Sightings During POLARSTERN Cruise ANT-XXIII/9. PANGAEA, 2009.
Citatione MLA (9a ed.)Burkhardt, Elke. Whale Sightings During POLARSTERN Cruise ANT-XXIII/9. PANGAEA, 2009.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.