Cita APA (7a ed.)

Shane, H. G., Keener, E. E., & Ferris, F. Easy steps to good english.

Cita Chicago Style (17a ed.)

Shane, Harold G., Edward E. Keener, y Florence Ferris. Easy Steps to Good English.

Cita MLA (8a ed.)

Shane, Harold G., et al. Easy Steps to Good English.