Cita APA (7a ed.)

Hallgr�imsson, B., & Hall, B. K. (2005). Variation. Elsevier Academic Press.

Cita Chicago Style (17a ed.)

Hallgr�imsson, Benedikt, y Brian K. Hall. Variation. Amsterdam ; Boston: Elsevier Academic Press, 2005.

Cita MLA (8a ed.)

Hallgr�imsson, Benedikt, y Brian K. Hall. Variation. Elsevier Academic Press, 2005.