Cita APA (7th ed.)

Lehmann-Ortega, L., & Roy, P. (2009). Introduction.

Cita Chicago (17th ed.)

Lehmann-Ortega, Laurence, i Pierre Roy. Introduction. 2009.

Cita MLA (8th ed.)

Lehmann-Ortega, Laurence, i Pierre Roy. Introduction. 2009.