Cita APA (7a ed.)

Frendo, E., & Schofield, J. (2006). Double dealing: [upper intermediate] : self-study book : business english course. Summertown Publishing.

Cita Chicago Style (17a ed.)

Frendo, Evan, y James Schofield. Double Dealing: [upper Intermediate] : Self-study Book : Business English Course. Summertown: Summertown Publishing, 2006.

Cita MLA (9a ed.)

Frendo, Evan, y James Schofield. Double Dealing: [upper Intermediate] : Self-study Book : Business English Course. Summertown Publishing, 2006.