Answer :
The correct option here, as I have found your question, would be: According to Carter, integrity "includes keeping one's commitments."
Here the quotation maks are used correctly as the example shows the grammatically correct way of using quotes in the mid of your sentence. You use quotes in your work to refer to the source and the words of another author. You can do that by either clearly showing it in a new paragraph with quotation marks, if it is a longer quote, or if you incorporate it into your sentence you like this.
Here the quotation maks are used correctly as the example shows the grammatically correct way of using quotes in the mid of your sentence. You use quotes in your work to refer to the source and the words of another author. You can do that by either clearly showing it in a new paragraph with quotation marks, if it is a longer quote, or if you incorporate it into your sentence you like this.