Cita APA (7a ed.)

Schofield, J., & Frendo, E. (2006). Double dealing: [upper Intermediate : student's book] business english course. Summertown Publishing.

Cita Chicago Style (17a ed.)

Schofield, James, y Evan Frendo. Double Dealing: [upper Intermediate : Student's Book] Business English Course. Summertown: Summertown Publishing, 2006.

Cita MLA (9a ed.)

Schofield, James, y Evan Frendo. Double Dealing: [upper Intermediate : Student's Book] Business English Course. Summertown Publishing, 2006.