APA
Mackin R., . (1961). Exercises in english patterns and usage. Oxford University Press, London: .
Chicago
Mackin Ronald, . 1961. Exercises in english patterns and usage. Oxford University Press, London: .
Harvard
Mackin R., . (1961). Exercises in english patterns and usage. Oxford University Press, London: .
MLA
Mackin Ronald, . Exercises in english patterns and usage. Oxford University Press, London: . 1961.