Books:

1. Begon, Michael et.al. Ecology: from Individuals to Ecosystems. City: Blackwell Publishing, Incorporated, 2005.   
2. Schowalter, Timothy. Insect Ecology. San Diego: Elsevier/Academic, 2006.

Journals:

1. Henk Wolda. The equilibrium concept and density dependence tests What does it all mean?,Oecologia, Springer-Verlag , 81 : 430-432, 1989.
2. Alan A. Berryman. The Orgins and Evolution of Predator-Prey Theory. Ecology,Vol. 73, No. 5, pp. 1530-1535,1992.
3. A. H. A. WYNN. Population Stability .Nature London 237, 181, 1972

Webliography:

1. http://www.blc.arizona.edu/courses/182/masel_pepper/PDFs/Population_Ecology.pdf