Morsella, E., Feinberg, G. H., Cigarchi, S., Newton, J. W., & Williams, L. E. (2010). Sources of avoidance motivation: Valence effects from physical effort and mental rotation. Springer US.

Morsella, Ezequiel, Giles H. Feinberg, Sepeedeh Cigarchi, James W. Newton, i Lawrence E. Williams. Sources of Avoidance Motivation: Valence Effects From Physical Effort and Mental Rotation. Springer US, 2010.

Morsella, Ezequiel, et al. Sources of Avoidance Motivation: Valence Effects From Physical Effort and Mental Rotation. Springer US, 2010.