Note that the act of taking and using the ideas or words of another is plagiarism motivation is not relevant. Ignorance or sloppiness is no excuse. This can be confusing for students when an author quotes material from someone else. The best rule of thumb is to go to the primary source. If an author quotes someone else, go to that quoted source.
Page numbers are always necessary when quoting or paraphrasing.
In the first in-text citation of items with three or more authors, list all names. In citations with two authors, list both the authors' last names. If you include more than one item by any author, list those items in chronological order. Do not number the references. Type the first line of the reference flush to the left margin.