SICP Book (PDF Copy) http://deptinfo.unice.fr/~roy/sicp.pdf
Section 1.3: Higher Order Procedures (http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-12.html#%_sec_1.3)
Problems: ?
Meetup: http://www.meetup.com/London-SICP-Study-Group/events/98703422/