Glutz von Blotzheim: Handbuch der Vögel Mitteleuropas (1997) ; Daniel Oertli & Robert Udelsman: Surgery Thyroid and Parathyroid Glands ; Jorg Kuhn & Vinzenz Ziswiler: Wald Tiere (1972) ;
Zoologisches Museum University Zurich ; Pro Natura ; World Wildlife Fund ; Hallwag-Verlag ;
zoological, natural, and ornithological drawing and painting
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