Cita APA (7a ed.)

Gorell, R. M., & Laird, C. (1963). Modern English workbook (2nd ed.). Prentice-Hall.

Cita Chicago Style (17a ed.)

Gorell, Robert M., y Charlton Laird. Modern English Workbook. 2nd ed. Englewood Cliffs, N. J.: Prentice-Hall, 1963.

Cita MLA (8a ed.)

Gorell, Robert M., y Charlton Laird. Modern English Workbook. 2nd ed. Prentice-Hall, 1963.