Skjeltorp, A., & Helgesen, G. (1989). QUALITATIVE ASPECTS OF CONDENSATION, ORDERING AND AGGREGATION.
芝加哥风格引文Skjeltorp, A., 与 G. Helgesen. QUALITATIVE ASPECTS OF CONDENSATION, ORDERING AND AGGREGATION. 1989.
MLA引文Skjeltorp, A., 与 G. Helgesen. QUALITATIVE ASPECTS OF CONDENSATION, ORDERING AND AGGREGATION. 1989.
警告：这些引文格式不一定是100％准确.