A1C is a lab test that shows the average level of blood sugar (glucose) over the previous 3 months. It shows how well you are controlling your diabetes.
APA guidelines stipulate rules for punctuation, tables, headings, statistics and citations. Citing your sources according to APA style helps you avoid plagiarism and boost your paper's credibility. When you cite or mention a book in a paper, you should italicize the title. Citations of books in your Reference List should begin with the last name of the book's author, then the author's initials.
Actually the text of the APA manual does not say this title should be bold \(p. 37\), but the it is in bold in the sample paper \(p. 59\). It actually seems to imply it should be in italics, but I think this an artifact of some sloppy copy editing. Both the text and the sample papers use different format here.