Hempel, I., & van Franeker, J. A. (2003). Oberservation of birds at station PS14/157 along 49° West. PANGAEA.
Citazione stile Chigago Style (17a edizione)Hempel, Irmtraut, e Jan Andries van Franeker. Oberservation of Birds at Station PS14/157 Along 49° West. PANGAEA, 2003.
Citatione MLA (9a ed.)Hempel, Irmtraut, e Jan Andries van Franeker. Oberservation of Birds at Station PS14/157 Along 49° West. PANGAEA, 2003.
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