Raytheon Learning Systems Company. Dage-Bell Corporation. Instruction Manual: Television Camera System, Type XRS-20 (Part Numbers 101598 and 101599). Manual Part No. 970129-01.. Michigan City, IN: Raytheon Learning Systems Company., 1967.

Raytheon Learning Systems Company. Dage-Bell Corporation. Instruction Manual: 101580-01 and 101581-01 Video Switchers.. Michigan City, IN: Raytheon Learning Systems Company., 1967.