MLA

Shafer, Douglas, and Valery Romanovski. The Center and Cyclicity Problems. Birkhäuser Boston, 2009.

APA

Shafer, D., & Romanovski, V. (2009). The Center and Cyclicity Problems. Birkhäuser Boston.

Chicago

Shafer, Douglas, and Valery Romanovski. The Center and Cyclicity Problems. : Birkhäuser Boston, 2009.