Cita APA (7a ed.)

Gibson, C. M., & Richards, I. (1957). First steps in reading English: A first book for readers to be. Pocket Books.

Cita Chicago Style (17a ed.)

Gibson, Christine M., y I.A Richards. First Steps in Reading English: A First Book for Readers to Be. New York: Pocket Books, 1957.

Cita MLA (9a ed.)

Gibson, Christine M., y I.A Richards. First Steps in Reading English: A First Book for Readers to Be. Pocket Books, 1957.