Weltens, H. H. (1989). The attrition of French as a foreign language. Foris Publications.
芝加哥风格引文Weltens, Hubertus H. The Attrition of French as a Foreign Language. Dordrecht [The Netherlands]: Foris Publications, 1989.
MLA引文Weltens, Hubertus H. The Attrition of French as a Foreign Language. Foris Publications, 1989.
警告：这些引文格式不一定是100％准确.