1. Fourcade;Adams;The South African Journal of Photogrammetry,1975
2. Anon 1927 The Barr and Stroud Plotting Apparatus Barr and Stroud Technical Pamphlet No. 386. 15 pages+12 figures
3. Anon 1939 Specification and brief description of the Barr and Stroud Stereogoniometer and Plotter Type ZA2 and Plotting Board Type HB9 Barr and Stroud Technical Pamphlet No. 863. 10 pages+4 figures
4. A relative orientation;Dawe;Photogrammetric Record,1974