User:Kcardos2/Reciprocity (social psychology)/Bibliography

Schweinfurth, M. K., & Call, J. (2019). Revisiting the possibility of reciprocal help in non-human primates. Neuroscience and Biobehavioral Reviews, 104, 73–86. https://doi.org/10.1016/j.neubiorev.2019.06.026