Cita APA (7th ed.)

Dummett, P. (2013). Life: Upper intermediate. Workbook (1a. ed.). National Geographic.

Cita Chicago (17th ed.)

Dummett, Paul. Life: Upper Intermediate. Workbook. 1a. ed. Hampshire: National Geographic, 2013.

Cita MLA (9th ed.)

Dummett, Paul. Life: Upper Intermediate. Workbook. 1a. ed. National Geographic, 2013.