एपीए उद्धरण

Happel, J. (1975). Chemical process economics. New York: Marcel Dekker.

शिकागो स्टाइल उद्धरण

Happel, John. Chemical Process Economics. New York: Marcel Dekker, 1975.

एमएलए उद्धरण

Happel, John. Chemical Process Economics. New York: Marcel Dekker, 1975.