need to gather information related to the research topic as the source material such as books, newspapers, magazines, yearbooks science, ... are stored in the library or on the internet. The results obtained from the experiments, experimental, field, practice, investigation, ... Results of the collection of information is a list of references, in which the document is sorted by the author's name or the name of the document, ...
đang được dịch, vui lòng đợi..