Cita APA (7a ed.)

Martins, E. P., Amos, E., & Pasqualin, E. (1980). Graded english. Moderna Hamburg.

Cita Chicago Style (17a ed.)

Martins, Elisabeth Prescher, Eduardo Amos, y Ernesto Pasqualin. Graded English. São Paulo, SP: Moderna Hamburg, 1980.

Cita MLA (9a ed.)

Martins, Elisabeth Prescher, et al. Graded English. Moderna Hamburg, 1980.