APA
Allen R., . (1990). The Concise oxford dictionary of current English. New York: Oxford Univesity Press.
Chicago
Allen R.E, . 1990. The Concise oxford dictionary of current English. New York: Oxford Univesity Press.
Harvard
Allen R., . (1990). The Concise oxford dictionary of current English. New York: Oxford Univesity Press.
MLA
Allen R.E, . The Concise oxford dictionary of current English. New York: Oxford Univesity Press. 1990.