Ferreira, J. J.; de Souza, C. S.; de Castro Salgado, L. C.; Slaviero, C.; Leitao, C. F.; de F Moreira, Fabio (2012). "Combining cognitive, semiotic and discourse analysis to explore the power of notations in visual programming". 2012 IEEE Symposium on Visual Languages and Human-Centric Computing (VL/HCC). IEEE. pp.101–108. Bibcode:2012vlhc.conf...36F. doi:10.1109/VLHCC.2012.6344492. ISBN978-1-4673-0852-6.
Ferreira, J. J.; de Souza, C. S.; de Castro Salgado, L. C.; Slaviero, C.; Leitao, C. F.; de F Moreira, Fabio (2012). "Combining cognitive, semiotic and discourse analysis to explore the power of notations in visual programming". 2012 IEEE Symposium on Visual Languages and Human-Centric Computing (VL/HCC). IEEE. pp.101–108. Bibcode:2012vlhc.conf...36F. doi:10.1109/VLHCC.2012.6344492. ISBN978-1-4673-0852-6.