Cita APA (7th ed.)

McKay, S. (1980). Writing for a specific purpose. Prentice-Hall.

Cita Chicago (17th ed.)

McKay, Sandra. Writing for a Specific Purpose. Englewood Cliffs, N.J: Prentice-Hall, 1980.

Cita MLA (9th ed.)

McKay, Sandra. Writing for a Specific Purpose. Prentice-Hall, 1980.