APA (7th ed.) Citation

Marques, A., & Soeiro, R. (1989). Time for english (15.ed.). Ática W. Roth.

Chicago Style (17th ed.) Citation

Marques, Amadeu, and Roberto Soeiro. Time for English. 15.ed. São Paulo, SP: Ática W. Roth, 1989.

MLA (9th ed.) Citation

Marques, Amadeu, and Roberto Soeiro. Time for English. 15.ed. Ática W. Roth, 1989.