Gaya APA
P.M, K., Schaik, C, V. (2006).
Cooperation in Primates and Humans mecanisms and Evolution .
Germany:
Springer.
Gaya MLA
P.M, Kappeler., Schaik, C.P., Van.
"Cooperation in Primates and Humans mecanisms and Evolution".
Germany:
Springer,
2006.
Buku Text.