Gaya APA

Heasley, L, H, B. (2009). Study Writing: a course in writing skills for academic purposes (Ed. 2, Cet. 4). Cambridge: Cambridge University Press.

Gaya MLA

Heasley, Liz, Hamp-Lyons, Ben. "Study Writing: a course in writing skills for academic purposes". Ed. 2, Cet. 4 Cambridge: Cambridge University Press, 2009. Book.