APA
                    Claus Zimmermann R. G. D. V. P. H. J. V., . (2014). Environmentally Friendly Coastal Protection. Germany: Springer.
                
                    Chicago
                    Claus Zimmermann Robert G Dean Valeri Penchev Henk Jan Verhagen, . 2014. Environmentally Friendly Coastal Protection. Germany: Springer.
                
                    Harvard
                    Claus Zimmermann R. G. D. V. P. H. J. V., . (2014). Environmentally Friendly Coastal Protection. Germany: Springer.
                
                    MLA
                    Claus Zimmermann Robert G Dean Valeri Penchev Henk Jan Verhagen, . Environmentally Friendly Coastal Protection. Germany: Springer. 2014.