Never
A primary source is one with first-hand knowledge, privy to or actually involved in the activity in question.
In research, you must document the source of all specific information unless it is considered common knowledge. Common knowledge includes widely known facts that are easily verifiable and not attributed to a specific source.
Facts which are not considered common knowledge should be cited, regardless of copyright. Wikipedia articles, for example, should still be cited.
Common knowledge does not have to be cited in academic writing because it is information that is widely known and accepted by the general public, making it unnecessary to attribute a specific source.
Old books that were published before censorship occuredAccording to Hindu Scriptures, any valid source of knowledge (Pramanam) should pass the following test1. It should reveal an object not revealed through another source of knowledge. For example the eyes are valid source of knowledge because the reveal colors and forms which cannot be revealed through other sources of knowledge (the ears or smell etc. cannot reveal colors and forms)2. The knowledge revealed cannot be contradicted by another source of knowledge. The color of an object revealed by the eyes cannot be contradicted by the ears or smell or touch etc.)3. The knowledge produced should be unambiguous4. The knowledge produced should be definite (ears revealing sounds without meaning are not a valid source)
To my knowledge, trees are like plants in that they require sunlight. Rain is a common source of food.
Common knowledge information does not need to be cited in a paper, as it is information that is widely known and accepted. However, if you are unsure whether something is common knowledge, it is always best to err on the side of caution and provide a citation to give credit to the original source.
source of knowledge should be include all sourcese that give the basic information such as scientific method and ttrial and error also traition and reasoning.
No, a Blad-Cypress is a compound leaf. Source: Common knowledge from Biology Class
Facts and common knowledge that are widely known and accepted do not typically need to be cited. However, if the information is not widely known or if it is critical to your argument, it is best practice to cite the source to provide credibility and avoid plagiarism.
Ask yourself, "Did this information or idea come from my own thoughts and knowledge, or did I learn it from an external source?" If the answer is the latter, then you should cite the source to give credit.
Common knowledge does not need to be referenced, as it is widely known and accepted by most people. However, if there is any doubt about whether information qualifies as common knowledge, it is best to provide a reference to support it.