20 p's / 21 p's / 22 p's

http://www.koganpageusa.com/product/20-Ps-of-Marketing,2372.aspx
http://www.f5onmarketing.com/2013/01/the-new-p-of-marketing.html

http://www.slideshare.net/josephdeungria/13-p-approach-for-marketing-analysis-2010-version