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Sources
Encyclopedias, handbooks = large volume sets of commonly accepted ideas
Reviewed books = works of more than 75,000 words which have been reviewed by a variety of sources for their research strengths and weaknesses
Randomized trials = tests that evaluate one idea only, not allowing bias or influence from other ideas, from a truly random sample
Peer-reviewed research articles = works of 10,000 - 50,000 words which have been reviewed by a variety of sources for their research strengths and weaknesses
Cohort studies = tests that evaluate ideas, from a sample greater than 10
Case studies = < 10 examples, which may contain unique situational developments not seen in a larger population
Magazine or newspaper articles = works of 10,000 - 50,000 words which have not been reviewed by a variety of sources for their research strengths and weaknesses
Interviews = described discussion with a person or people, speaking not under oath for penalty of perjury
No or little reviewed books = books that were not reviewed by a variety of sources for their research strengths and weaknesses
Student papers = works written for curriculum submission, including dissertations and theses
Conversations = casual discussion that may allow bias or influence from other ideas
Editorials = works intended to persuade for or against any opinion
Opinions = works that describe only one viewpoint, allowing bias or influence from other ideas
Speeches = persuasive spoken or written rhetoric which is often editorial or opinionated