Cita APA (7a ed.)

De Bruyn, G. M., Kroes, K., & Lyfareff, R. (1999). Advanced ABAP programming for SAP. Prima Tech.

Cita Chicago Style (17a ed.)

De Bruyn, Gareth M., Ken Kroes, y Robert Lyfareff. Advanced ABAP Programming for SAP. Rocklin: Prima Tech, 1999.

Cita MLA (9a ed.)

De Bruyn, Gareth M., et al. Advanced ABAP Programming for SAP. Prima Tech, 1999.