Cita APA (7th ed.)

MACKIN, R., & SEIDL, J. (1979). Exercises in english patterns and usage.-- Ed. 2. Oxford University Press.

Cita Chicago (17th ed.)

MACKIN, Ronald, i Jennifer SEIDL. Exercises in English Patterns and Usage.-- Ed. 2. Oxford: Oxford University Press, 1979.

Cita MLA (9th ed.)

MACKIN, Ronald, i Jennifer SEIDL. Exercises in English Patterns and Usage.-- Ed. 2. Oxford University Press, 1979.