Ethical scientific writing is always honest, clear and accurate and gives credit to both ideas and text (including small phrases) that belong to another author. Ethical scientific writing represents an implicit contract between yourself as writer and the reader, whereby the reader believes that everything you have written is your own work and that if this is not the case you will indicate this clearly by quotation marks and references, as appropriate. (Miguel Roig. A Guide to Ethical Writing. Available to download  at http://ori.hhs.gov/education/products/plagiarism/