Cronin, K. A., Schroeder, K. K. E., Rothwell, E. S., Silk, J. B., & Snowdon, C. T. (2009).
Cooperatively breeding cottontop tamarins (Saguinus oedipus) do not donate rewards to their long-term mates.
Journal of Comparative Psychology, 123(3), 231-241. doi:10.1037/a0015094.