APA
                    Pete Sawyer B. P. P. H., . (2007). Requirements Engineering: Foundation for Software Quality. Germany: Springer.
                
                    Chicago
                    Pete Sawyer Barbara Paech Patrick Heymans, . 2007. Requirements Engineering: Foundation for Software Quality. Germany: Springer.
                
                    Harvard
                    Pete Sawyer B. P. P. H., . (2007). Requirements Engineering: Foundation for Software Quality. Germany: Springer.
                
                    MLA
                    Pete Sawyer Barbara Paech Patrick Heymans, . Requirements Engineering: Foundation for Software Quality. Germany: Springer. 2007.