De Wulf, R. 374/1.1: Briefwisseling & reeksen kabinetsnota's.
芝加哥风格引文De Wulf, Roger. 374/1.1: Briefwisseling & Reeksen Kabinetsnota's.
MLA引文De Wulf, Roger. 374/1.1: Briefwisseling & Reeksen Kabinetsnota's.
警告：这些引文格式不一定是100％准确.
APA引文