Skojec, Chelsea (3 May 2016). "Conversation: Frans de Waal". Earth Island Journal. Archived from the original on 7 December 2023. Retrieved 21 March 2024.
Skojec, Chelsea (3 May 2016). "Conversation: Frans de Waal". Earth Island Journal. Archived from the original on 7 December 2023. Retrieved 21 March 2024.