The Definitive Guide to Grails

MLA

Rocher, Graeme Keith, et al. The Definitive Guide to Grails. Apress, 2009.

APA

Rocher, G. Keith, Brown, J., Laforge, G., & Brown, J. Scott. (2009). The Definitive Guide to Grails. Apress.

Chicago

Rocher, Graeme Keith, Jeff Brown, Guillaume Laforge, and Jeff Scott Brown. The Definitive Guide to Grails. : Apress, 2009.