FK-43: Echoics
FK-44: Mands
FK-45: Tacts
FK-46: Intraverbals
M Alice Shillingsburg, Michael E Kelley, Henry S Roane, April Kisamore, Melissa R Brown
J Appl Behav Anal. 2009 Summer; 42(2): 209–223. doi: 10.1901/jaba.2009.42-209
Carol Murphy, Dermot Barnes-Holmes
J Appl Behav Anal. 2009 Summer; 42(2): 253–268. doi: 10.1901/jaba.2009.42-253
Jonathan Tarbox, Wendy Madrid, Barbara Aguilar, Wendy Jacobo, Averil Schiff
J Appl Behav Anal. 2009 Winter; 42(4): 901–906. doi: 10.1901/jaba.2009.42-901