PhilosophyPages: Logical Positivism Concise survey of this school and the related doctrine of "ethical emotivism." http://www.philosophypages.com/hy/6q.htm
Wikipedia: Logical Positivism Entry from the openly-edited encyclopedia. http://www.wikipedia.org/wiki/Logical_positivism
Comte, Ayer and Logical Positivism Lecture reviewing the development of this doctrine and its impact on psychology. http://www.sar.bolton.ac.uk/ltl/lecture2/logical_positivism.htm
FOLDOC: Logical Positivism Entry from this philosophical database, including an excerpt from The Ism Book. http://www.swif.uniba.it/lei/foldop/foldoc.cgi?logical+positivism
Logical Positivism Site dedicated to this doctrine, with quotes, frequently asked questions, and links. http://logicalpositivism.org/shweb?file=home
How the Cold War Killed Logical Empiricism A 2001 paper by George Reisch considering the reasons why philosophers of science abandoned positivism in the 1950s and 1960s. http://www.iit.edu/departments/humanities/impact/colloquium/reisch_2001s.html