APA (7th ed.) Citation
Allen, J., & Widdowson, H. (1974). English in Focus. English in Physical Science. Oxford University Press.
Chicago Style (17th ed.) Citation
Allen, J.P.B, and H.G Widdowson. English in Focus. English in Physical Science. Oxford: Oxford University Press, 1974.
MLA (9th ed.) Citation
Allen, J.P.B, and H.G Widdowson. English in Focus. English in Physical Science. Oxford University Press, 1974.
Warning: These citations may not always be 100% accurate.