1. Introduction to the SIRIUS 1 Microcomputer, Part No. 100909-01A,1982
2. SIRIUS 1 Reference Manual for BASIC-86,1982
3. Data base interaction using a hand print terminal;Barker;International Journal of Man-Machine Studies,1982
4. A Practical Introduction to Authoring for Computer Assisted Instruction. Part 6: Interactive Audio, Working Paper;Barker,1985
5. Implementing pictorial interfaces using a high resolution digitizer;Barker;International Journal of Man-Machine Studies,1985