The women's leadership community is well aware of the importance of mentoring. However, it's always nice to revisit the facts. The below link mentions that in 1998, 7 out of 10 women of color who had a mentor received a promotion. It also showcases the correlation, for all women, between number of mentors and moving up the corporate ladder.
http://www.blackenterprise.com/cms/exclusivesopen.aspx/id/4962&p=1
Below, is a story discussing how mentoring is THE most important element for career advancement, even above hard work and intelligence.
http://storymojaafrica.co.ke/main/2008/09/
would-you-like-to-be-mentored/
Both of the above stories cite Catalyst research.
Here is a book on mentoring:
http://www.amazon.com/gp/aw/d.html/ref=redir_mdp_mobile/105-9740600-3278014?ie=UTF8&a=037550060X
So, make a list of your mentors. They may not even know they are your mentors. That is okay. Reach out to them today. Thank them. Keep the relationship going and find new ones. Our success depends on it.