The Definitive Guide to Grails 2

MLA

Brown, Jeff, et al. The Definitive Guide to Grails 2. Apress, 2013.

APA

Brown, J., Brown, J. Scott, Rocher, G. Keith, & Rocher, G. (2013). The Definitive Guide to Grails 2. Apress.

Chicago

Brown, Jeff, Jeff Scott Brown, Graeme Keith Rocher, and Graeme Rocher. The Definitive Guide to Grails 2. : Apress, 2013.