Passive VoiceThis handout will help you understand what the passive voice is, why many professors and writing instructors frown upon it, and how you can revise your paper to achieve greater clarity. Some things here may surprise you. We hope this handout will help you to understand the passive voice and allow you to make more informed choices as you write. (Credit: The University of North Carolina at Chapel Hill)
APA Style Guide to Electronic References
The Elements of Style by 