Final answer:
The underlined portion of the citation details how to format titles in an annotated bibliography, with books italicized and articles in quotation marks. It also explains the use of in-text citations for directing readers to the Works Cited page.
Step-by-step explanation:
The underlined portion of the citation describes how to format the title of the source and where it appears in an annotated bibliography entry. According to the provided information, book titles should be formatted in italicized text, while articles from prints or online publications should be enclosed in quotation marks. This formatting distinction is important in clearly identifying the type of source being cited. For example, a piece from a journal would have its title in quotation marks followed by the details of the journal itself, which is considered the 'container' and is generally italicized.
Moreover, in-text citations are crucial for directing readers to the full citation details on the Works Cited page. This underlined portion also highlights the difference in treatment of source titles depending on whether they are considered part of a larger work (container) or they are self-contained.