Cita APA

Mackin, R., & Mackin, R. (1976). A short course in spoken English ([1. edition].). Portland, Or.: English Language Services.

Citación estilo Chicago

Mackin, Ronald, y Ronald Mackin. A Short Course in Spoken English. [1. edition]. Portland, Or.: English Language Services, 1976.

Cita MLA

Mackin, Ronald, y Ronald Mackin. A Short Course in Spoken English. [1. edition]. Portland, Or.: English Language Services, 1976.