Primary sources present original information without it being condensed or evaluated. e.g. Diary, interview, thesis, speech, letter, journal article, play etc.
Secondary sources evaluate, interpret and describe primary sources. e.g. Some newspaper articles, books, journal articles.
Tertiary sources consist of informatin which is a distillation and collection of primary and secondardy sources, e.g. encyclopedias, dictionaries, bibliographies etc.
