Hi. You did not submit the pamphlet this question refers to, which makes it difficult for this question to be answered. However, I will try to help you as best I can.
As the National Congress is a political authority, made up of people who must be committed to the truth and accurate reporting of facts, Americans are likely to see a pamphlet published by Congress as a reliable source of information. The pamphlet can be considered credible if it is a political matter that has been drafted by a reputable and appropriate political group such as the national congress.