1. Armstrong, D. M. (1969). Colour-realism and the argument from microscope. In R. Brown & C. D. Rollins (Eds.), Contemporary philosophy in Australia (pp. 119–131). London.
2. Barragán, L. (1980). The Pritzker architecture prize 1980 laureate acceptance speech. http://www.pritzkerprize.com/sites/default/files/file_fields/field_files_inline/1980_Acceptance_Speech.pdf. Access March 28, 2014.
3. Byrne, A., & Hilbert, D. R. (1997). Colors and reflectances. In A. Byrne, & D. R. Hilbert (Eds.), Readings on colors, vol. 1: The philosophy of color (pp. 263–288). Massachusetts: Cambridge.
4. Campbell, K. (1969). Colours. In R. Brown & C. D. Rollins (Eds.), Contemporary philosophy in Australia (pp. 132–157). London.
5. Carnap, R. (1932). Über Protokollsätze. In Erkenntnis 3 (pp. 215–228) (English: On Protocol Sentences. In Nous 21 (1981), pp. 457–470).