Citazione Stile APA (7a Edizione)

ProQuest (Firm), Ball, M. J., & Muller, N. (2009). The Celtic languages (2nd ed.). Routledge.

Citazione stile Chigago Style (17a edizione)

ProQuest (Firm), Martin J. Ball, e Nicole Muller. The Celtic Languages. 2nd ed. New York, NY: Routledge, 2009.

Citatione MLA (9a ed.)

ProQuest (Firm), et al. The Celtic Languages. 2nd ed. Routledge, 2009.