1. Some Relations between Territory, Social Hierarchy, and Leadership in the Green Sunfish (Lepomis cyanellus)
2. Hafez, E. S. E. 1975.The Behaviour of Domestic Animals, 3rd Edition, 226–226. London: Bailliére Tindall.
3. Hafez, E. S. E. 1975.The Behaviour of Domestic Animals, 3rd Edition, 204–204. London: Bailliére Tindall.
4. Hafez, E. S. E. 1968.Adaption of Domestic Animals, 361–363. Philadelphia: Lea Febiger.