Cita APA (7a ed.)

Abbs, B., & Freebairn, I. (1988). Discoveries: Students' Book 2 (5ª ed.). Longman Group.

Cita Chicago Style (17a ed.)

Abbs, Brian, y Ingrid Freebairn. Discoveries: Students' Book 2. 5ª ed. Tonsa (San Sebastián): Longman Group, 1988.

Cita MLA (9a ed.)

Abbs, Brian, y Ingrid Freebairn. Discoveries: Students' Book 2. 5ª ed. Longman Group, 1988.