This is courtesy of Tom Turner - http://www.managementstudyguide.com/organization-culture.htm
Factors affecting culture - http://www.managementstudyguide.com/factors-affecting-organization-culture.htm
Edgar Schein's model - http://www.managementstudyguide.com/edgar-schein-model.htm
Geert Hofstede's model - http://www.managementstudyguide.com/hofstede-model.htm
Charles Handy's model - http://www.managementstudyguide.com/charles-handy-model.htm
There are some other interesting links on the left hand side of the page.
