European Commission. (1998). GCAS operational requirements and certification: GORAC. Office for Official Publications of the European Communities ; Bernan Associates [distributor].
芝加哥风格引文European Commission. GCAS Operational Requirements and Certification: GORAC. Luxembourg : Lanham, Md.: Office for Official Publications of the European Communities ; Bernan Associates [distributor], 1998.
MLA引文European Commission. GCAS Operational Requirements and Certification: GORAC. Office for Official Publications of the European Communities ; Bernan Associates [distributor], 1998.
警告：这些引文格式不一定是100％准确.