What is/was the main challenge(s) for the performing arts in Europe in the years to come?

MLA

Collier, Ruth, Jasper Nijsmans, and Christophe Slagmuylder. What Is/was the Main Challenge(s) for the Performing Arts In Europe In the Years to Come?. Brussel: [s.n.], 2012.

APA

Collier, R., Nijsmans, J., & Slagmuylder, C. (2012). What is/was the main challenge(s) for the performing arts in Europe in the years to come?. Brussel: [s.n.].

Chicago

Collier, Ruth, Jasper Nijsmans, and Christophe Slagmuylder. What Is/was the Main Challenge(s) for the Performing Arts In Europe In the Years to Come?. Brussel: [s.n.], 2012.