Fisher, W. W., Thompson, R. H., Piazza, C. C., Crosland, K., & Gotjen, D. (1997). On the relative reinforcing effects of choice and differential consequences.

Fisher, W W., R H. Thompson, C C. Piazza, K. Crosland, und D. Gotjen. On the Relative Reinforcing Effects of Choice and Differential Consequences. 1997.

Fisher, W W., et al. On the Relative Reinforcing Effects of Choice and Differential Consequences. 1997.