Cisco AAA/Identity/Nac :: ACS 5.3 Connect To Multiple Identity Stores

I understand that Cisco Secure ACS 5.3 supports the integration with existing external identity repositories such as Windows Active Directory and LDAP servers. In fact, in my environment, my ACS 5.3 is now integrated with AD and RSA.My question here is can Cisco Secure ACS 5.3 integrate with "multiple" WIndows AD, LDAP, RSA Server etc.? if yes, is there a Cisco document stating this? The keyword here is multipple.