Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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