Cita APA (7th ed.)

Eckstut-Didier, S., & Lubelska, D. (1989). Beneath the surface. Longman.

Cita Chicago (17th ed.)

Eckstut-Didier, Samuela, i Diana Lubelska. Beneath the Surface. Essex: Longman, 1989.

Cita MLA (9th ed.)

Eckstut-Didier, Samuela, i Diana Lubelska. Beneath the Surface. Longman, 1989.