Cita APA (7a ed.)

Ellis, M., & Ellis, P. (1985). Counterpoint: Workbook Two - elementary (1ª ed.).

Cita Chicago Style (17a ed.)

Ellis, Mark, y Printha Ellis. Counterpoint: Workbook Two - Elementary. 1ª ed. Edinburgh, 1985.

Cita MLA (9a ed.)

Ellis, Mark, y Printha Ellis. Counterpoint: Workbook Two - Elementary. 1ª ed. 1985.