APA (7th ed.) Citation

Figueiredo, L. C. d., Silveira, M. d. F., & Villaça, O. R. (1993). Let's speak English: Book 1. Ática.

Chicago Style (17th ed.) Citation

Figueiredo, Luciane Cassela de, Marília de Figueiredo Silveira, and Oscar Rubens Villaça. Let's Speak English: Book 1. São Paulo, SP: Ática, 1993.

MLA (9th ed.) Citation

Figueiredo, Luciane Cassela de, et al. Let's Speak English: Book 1. Ática, 1993.