http://books.google.com/books?id=7vW0f3VXnW4C&lpg=PA332&dq=grammar%20%22I%20should%20think%22&pg=PA332#v=onepage&q=grammar%20%22I%20should%20think%22&f=false
http://books.google.com/books?id=9Qn0DyUiKRUC&lpg=PA289&dq=grammar%20%22I%20should%20think%22&pg=PA289#v=onepage&q=grammar%20%22I%20should%20think%22&f=false
http://www.englishforums.com/English/MeaningOfIShouldThink/jzxdz/post.htm
http://www.ldoceonline.com/dictionary/should
--> 14 ...
Macmillan -> I should think ...
