Gaya APA

Harahap, H, A., Adnan, A. (1986). a Practical english grammar/A.J.Thomson, A.V.Martinet (4th.Ed.). Jena :: Oxford University Press.

Gaya MLA

Harahap, H., Adnan., Adnan, Asmadi. "a Practical english grammar/A.J.Thomson, A.V.Martinet". 4th.Ed. Jena :: Oxford University Press, 1986. .