1. …is only used to communicate the exact expression of the original. In any other case, use paraphrases.
2. …is highlighted typographically: e.g. by indentation / italics, or, with shorter quotes, by quotation marks. (Follow the guidelines of your profs.)
3. …is unaltered. Additions, omissions, highlighting are communicated; errors are copied as in the original.
3 facts and 3 questions while the pasta is cooking
Which quotation is correct?
(Details depend on the requirements of your profs.)
In the quotation, double quotation marks from the original must be converted to simple. It should be stated that the italic is from the original.
This quotation is correct.
The quotation may be formally correct, but alters the original statement.