Kull, K., Bogdanova, O., Gramigna, R., Heinapuu, O., Lepik, E., Lindström, K., Magnus, R., Moss, R. T., Ojamaa, M., Pern, T., Põhjala, P., Pärn, K., Raudmäe, K., Remm, T., Salupere, S., Soovik, E.-R., Sõukand, R., Tønnessen, M., & Väli, K. (2015). A hundred introductions to semiotics, for a million students: Survey of semiotics textbooks and primers in the world. Sign Systems Studies, 43(2/3), 281-346. https://doi.org/10.12697/SSS.2015.43.2-3.0