Gaya APA

Hamp-Lyons, L., Heasley, B. (1987). Study writing : a course in written English for academic and professional purposes . Cambridge: Cambridge University Press.

Gaya MLA

Hamp-Lyons, Liz., Heasley, Ben. "Study writing : a course in written English for academic and professional purposes". Cambridge: Cambridge University Press, 1987. Text.