Cita APA (7a ed.)

Campbell, C. M., & Robertson, E. F. (1991). Groups St. Andrews, 1989. Cambridge University Press.

Cita Chicago Style (17a ed.)

Campbell, C. M., y E. F. Robertson. Groups St. Andrews, 1989. Cambridge ; New York: Cambridge University Press, 1991.

Cita MLA (8a ed.)

Campbell, C. M., y E. F. Robertson. Groups St. Andrews, 1989. Cambridge University Press, 1991.