Cisco Systems, Cisco Network Foundation Protection (NFP) Framework.
Whitepaper: "Control Plane Policing Implementation Guide".
Definition: "The Management Plane... is used to manage the network elements... The Control Plane... is used to set up and maintain the network topology."
Cisco Networking Academy, CCNP Enterprise: Core Networking (ENCOR) v8.0.
Chapter: Network Architecture / Security.
Context: Defines the four planes: Data, Control, Management, and Services, specifically noting the Services plane handles specialized forwarding requirements.
Cisco Press, CCIE Routing and Switching v5.0 Official Cert Guide, Vol 1.
Section: "Foundation of Network Security".
Quote: Distinguishes traffic destined for the router (Control/Mgmt) versus traffic through the router (Data/Services).