Stanford Encyclopedia of Philosophy: Causal Processes: Bertrand Russell, Wesley Salmon, and conserved quantities. By Phil Dowe.
Stanford Encyclopedia of Philosophy: Counterfactual Theories of Causation: Discussion of analysis of causal statements in terms of counterfactual conditionals; by Peter Menzies.
Stanford Encyclopedia of Philosophy: Probabilistic Causation: Designates a group of philosophical theories that aim to characterize the relationship between cause and effect using the tools of probability theory.
Stanford Encyclopedia of Philosophy: The Metaphysics of Causation: Survey of theories of causal relata; by Jonathan Schaffer.