Hedström, Peter and Richard Swedberg, eds. 1998. Social Mechanisms: An Analytical Approach to Social Theory. Cambridge: Cambridge University Press. Describes approaches to thinking about mechanisms.
Little, D. 1991. Varieties of Social Explanation: An Introduction to the Philosophy of Social Science. Boulder, Co: Westview Press.
Stinchcombe, A. L. 1968. Constructing Social Theories. New York: Harcourt Brace & World.