There are two ways to give credit for a direct quote.
1. A Footnote
2. A phrase stating author and source.
Someone writing about fishing might use a quote to support the argument that fly fishing is a wonderful activity.
James Collins, in One Man's Mile, writes, "Perhaps the most captivating form of this pastime is fly-fishing: delivery of an artificial bug in an enticing way."
There is no need to cite any other information if this is all the reader needs to know about what James Collins has written.
Although a credit can be added to the end of the quote, a credit like this is connected to the quote for specificity.
A direct quote is a good way to support your point, but you must give credit. For some reason, although a quote is simply something written by someone else, when identified by author, it gains a degree of authority.
Next, we will look at how to give credit for a chart or graph.