Ekeh, P. P. (1974). Social exchange theory: The two traditions. Harvard University.
Chicago Style (17th ed.) ZitazioaEkeh, Peter P. Social Exchange Theory: The Two Traditions. Cambridge: Harvard University, 1974.
MLA (9th ed.) ZitazioaEkeh, Peter P. Social Exchange Theory: The Two Traditions. Harvard University, 1974.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.