Cita APA (7th ed.)

Dallas, D., & Iggulden, . M. (1990). Let's learn English. Longman.

Cita Chicago (17th ed.)

Dallas, Donald, i Margaret Iggulden. Let's Learn English. Harlow: Longman, 1990.

Cita MLA (8th ed.)

Dallas, Donald, i Margaret Iggulden. Let's Learn English. Longman, 1990.