Expand and improve

[edit]

Plenty of decent sources are available for expansion and sourcing this article. We do not delete what can be so easily improved. Schmidt, MICHAEL Q. 21:39, 13 January 2013 (UTC)[reply]

(Find sources: Google (books · news · scholar · free images · WP refs· FENS · JSTOR · TWL)
(Find sources: Google (books · news · scholar · free images · WP refs· FENS · JSTOR · TWL)
(Find sources: Google (books · news · scholar · free images · WP refs· FENS · JSTOR · TWL)