Building Your Own Credibility
At the core of winning over an audience is the ability to present an argument. Convincing others that your way of thinking is worthy can be very challenging and it will be an uphill battle if you build the foundation of your argument on poorly documented research. At stake is your credibility.
Citing and documenting trustworthy sources in your work will bolster the notion that what you have to say is credible and trustworthy. It will help convince your audience that you know what you talking about, that you are familiar with the historical context of your topic and that your contribution or perspective has value.
It also provides the information needed for others with similar interests to test your findings. Successful duplication of your research serves to strengthen your thesis and validate your conclusions: a desirable result. Improperly documenting your sources will hinder other researchers from achieving this goal.