Epistemology and Modern Physics: Essay by Schlick on this topic.
FOLDOC: Schlick Moritz: Brief article on this thinker, with links to related topics.
Moritz Schlick: Biographical information, with an emphasis on his assassination by a student in 1936.
Philosophy in Vienna 1900: Moritz Schlick: Biography, bibliography and timeline.
Schlick: Photograph and biographical note.
Wikipedia: Moritz Schlick: Entry from the open-access reference work.