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3. Beiträge zur Sozialpsychologie des Haushuhns;Schjelderup-Ebbe;Zeitschrift für Psychologie,1922
4. DEFRA 2019 Results of the 2018 FSA (Food Safety Authority) survey into slaughter methods in England and Wales. Report published by Department for Environment, Food & Rural Affairs (DEFRA) pp 58. Available at www.gov.uk/government/publications
5. Pheromones and Animal Behavior