APA (7th ed.) Citation

Keller, H., Keller, H., Jacobitz, J., & Jacobitz, J. (2003). ABAP Objects: The official reference : a comprehensive guide to all ABAP-language elements in two volumes. Galileo Press.

Chicago Style (17th ed.) Citation

Keller, Horst, Horst Keller, Joachim Jacobitz, and Joachim Jacobitz. ABAP Objects: The Official Reference : A Comprehensive Guide to All ABAP-language Elements in Two Volumes. New York [u.a.]: Galileo Press, 2003.

MLA (9th ed.) Citation

Keller, Horst, et al. ABAP Objects: The Official Reference : A Comprehensive Guide to All ABAP-language Elements in Two Volumes. Galileo Press, 2003.