Happel, J. (1975). Chemical process economics. New York: Marcel Dekker.
Trích dẫn kiểu ChicagoHappel, John. Chemical Process Economics. New York: Marcel Dekker, 1975.
MLA引文Happel, John. Chemical Process Economics. New York: Marcel Dekker, 1975.
警告：这些引文格式不一定是100％准确.