Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

Hamp-Lyons, Liz, i Ben Heasley. Study Writing: A Course in Written English for Academic and Professional Purposes. Cambridge: Cambridge University Press, 1987.

Cita MLA (9th ed.)

Hamp-Lyons, Liz, i Ben Heasley. Study Writing: A Course in Written English for Academic and Professional Purposes. Cambridge University Press, 1987.