Cita APA (7th ed.)

Christie, A., & Osborne, C. (1999). Black Coffee. Scherz.

Cita Chicago (17th ed.)

Christie, Agatha, i Charles Osborne. Black Coffee. Bern; München; Wien: Scherz, 1999.

Cita MLA (8th ed.)

Christie, Agatha, i Charles Osborne. Black Coffee. Scherz, 1999.