Very often, the people who have the most to say about a practice are those who want to change it. Therefore it should come as no surprise that some webpages on this list have a goal in mind. They are neither neutral nor above the fray. That, of course, does not imply that their factual claims are false or that their arguments are weak, but you are responsible for the use which you make of them.
If an argument does not seem valid to you, where does it go wrong? If claims are suspect, perhaps you ought to try to verify or disconfirm them from an independent source (which, of course, should not be less reliable than the source you are evaluating!). And beware of arguments that substitute emotional appeals for verifiable premises or long-tested, carefully stated ethical principles. Moreover, in writing academic papers, you should indicate the sources for statements you have directly quoted and for the unusual ideas you have consciously borrowed from writers other than yourself. That is, the source should be indicated by embedded references, endnotes or footnotes, along with a bibliography.
Many of the business ethics links here have already been collected by Manuel Velasquez in the fourth edition of his Business Ethics: Concepts and Cases (Prentice-Hall). Some links here have been suggested by students in my courses at Western Kentucky University. The inclusion here of a link to a website does not imply that I endorse the perspective of that website or any particular claims that may appear on it.