Include findings from a variety of viewpoints, not just those that agree with you. Cite publications that both support and challenge your thesis in an attempt to present a well-rounded survey of current scholarly work on your topic.
Find the latest publications on your topic to make your research more current. If you have some dated articles, try to find newer publications that address, build on or even challenge these earlier findings.
Paraphrase your findings objectively. Do not twist a writer's words or leave out major information pertaining to your topic. Read your findings carefully at least twice, taking notes, to ensure you thoroughly understand the writer's ideas and do not misrepresent them unwittingly.
Avoid lumping writers together whose arguments or research contain subtle but significant differences. It can be tempting to summarize an issue into two neat opposing sides in order to more easily challenge one and align yourself with another. However, you should think of writers as situated on a spectrum of perspectives, instead of polarized opposites.