I am a student new to research area, and i am filling my article summary table. Currently I have a conference paper that i am trying to find the research methodology the author used to do his research. The author did not make surveys, questionnaires or interviews, he just based his paper upon other reports and results from other articles. So the closest i can think of this methodology is that its either a library research or an internet research but I am not sure which of them as the difference between them not clear to me. So please help me regarding this and if you think that his methodology is neither of the two also give your thoughts.