Whenver you quote something, credit it and separate it from your writing by quotation marks if it's short, or by breaking your paragraph for longer quotes. Also, include references in the text like (Author, Date) both for any quotes and for any paraphrases or ideas that you have taken from another source. Basically, everything that comes from an external source should be credited. If you didn't write it or think it, then you should let your reader know where you took the words or the idea from.
this is a long advice,but i hope it is a useful one.(quoted)
A patent protects the inventor's rights in a new piece of equipment or a child's toy; a trademark, a symbol that identifies a company's product, can be registered to protect the company's right to use that mark; and a copyright signifies original creation and ownership of written words. As a student you may use copyrighted material in your research paper under the doctrine of fair use, which allows the use of others' words for "purposes such as criticism, comment, news reporting, teaching (including multiple copies for classroom use), scholarship, or research. . . " (U.S. Code)
Plagiarism is offering the words or ideas of another person as one's own. A major violation is the use of another student's work or the purchase of a "canned" research paper. Also flagrantly dishonest are writers who knowingly copy whole passages into their paper without documentation. Unintentional carelessness, such as the failure to enclose quoted material within quotation marks, is a gray area; while such mistakes are not flagrant acts of plagiarism, these errors can mar an otherwise fine piece of research. It is up to the student researcher to learn how to document ideas borrowed from source material, and how to establish credibility through appropriate citations.
CHECKLIST: Documenting Your Sources
Let a reader know when you begin borrowing from a source by introducing a quotation or paraphrase with the name of the authority.
Enclose within quotation marks all quoted materials—a key word, a phrase, a sentence, a paragraph.