Final answer:
It is true that in APA style, referencing does not use underlining or bold font. Italics are used for book titles in the reference list, and quotation marks are used for direct quotes within the text, not for reference entries.
Step-by-step explanation:
The statement that when referencing a source in APA style, nothing is underlined, and nothing is put in bold font is true. In APA style, one must follow particular formatting rules. Book titles within the reference list are italicized, but text in the reference entries must never be in bold or underlined. To credit the source of a quotation, you are expected to use quotation marks around the words if it's a direct quote, followed by a parenthetical citation with the author's name and the year of publication.
When dealing with sources that do not have page numbers, such as some online materials, APA style recommends providing other locator information, like the paragraph number or section heading. This helps the reader find the exact part of the source you are referencing. Moreover, in APA format, the reference list at the end of your paper should include all sources you've cited in the text, and each entry must follow specific APA guidelines regarding author names, publication dates, titles, and retrieval information.