Spillner, A., Linz, T., & Schaefer, H. (2011). Software testing foundations: A study guide for the certified tester exam : foundation level, ISTQB compliant (3rd ed.). Rocky Nook ; Distributed by O'Reilly Media.

Spillner, Andreas, Tilo Linz, and Hans Schaefer. Software Testing Foundations: A Study Guide for the Certified Tester Exam : Foundation Level, ISTQB Compliant. 3rd ed. Santa Barbara, CA : Sebastopol, CA: Rocky Nook ; Distributed by O'Reilly Media, 2011.

Spillner, Andreas, et al. Software Testing Foundations: A Study Guide for the Certified Tester Exam : Foundation Level, ISTQB Compliant. 3rd ed. Rocky Nook ; Distributed by O'Reilly Media, 2011.