APA
Horsburgh D., . (19731982). Strengthen Your English. Delhi: Oxford University Press.
Chicago
Horsburgh D, . 19731982. Strengthen Your English. Delhi: Oxford University Press.
Harvard
Horsburgh D., . (19731982). Strengthen Your English. Delhi: Oxford University Press.
MLA
Horsburgh D, . Strengthen Your English. Delhi: Oxford University Press. 19731982.