Hadley, G. (1971). Variational Methods in Economics. ELSEVIER.
芝加哥风格引文Hadley, G. Variational Methods in Economics. ELSEVIER, 1971.
MLA引文Hadley, G. Variational Methods in Economics. ELSEVIER, 1971.
警告：这些引文格式不一定是100％准确.
APA引文