Final answer:
In an in-text citation sentence, the period is placed inside the quotation marks if no citation is provided in parentheses. When parenthetical citations are used, the period comes after the closing parenthesis.
Step-by-step explanation:
The placement of a period in an in-text citation sentence depends on whether the sentence includes direct quotations. If there is no citation in parentheses, place the period inside the quotation marks. For example:
The meteorologist said, "Today's weather will be sunny and mild."However, with parenthetical citations, you should place the period after the parentheses. An example with a citation would be: Smith shows us the importance of good time management skills when she says, "90% of A and B students begin their essays at least two weeks before they are due" (Flynn).
Correct use of periods in citations ensures that the reader knows where your borrowed information ends and allows them to find the original source.