You should know the difference between a deductive and non-deductive argument. Be sure to include both stated and implied premises which support the conclusion. But there must be some because authors are human beings just like everybody else. So I have to say there must be some.
Most arguments are non-deductive.
In fact, many seemingly non-deductive arguments are supported by authors' implied premises which actually make the argument deductive. The implied premises usually lie behind the stated premises as reasons for the stated premises. It's often really a matter of correctly interpreting the author's intention. Sometimes it's a matter of interpreting the author's strength of opinion in offering a conclusion. 4849 West Ilinois Avenue Dallas, TX 75211 Please include a stamped, self-addressed envelope for returning your graded work.