(treat the subtitle as a second title and italicize or underscore all titles regardless of whether they would take italics or quotes in text.)
The subtitle explains the book, telling them what they'll get out of reading it. The subtitle is at least as important as the title because that last bit—what people will get from your book—is the only thing that will actually sell it.
Answers & Comments
Answer:
yes.
Explanation:
(treat the subtitle as a second title and italicize or underscore all titles regardless of whether they would take italics or quotes in text.)
The subtitle explains the book, telling them what they'll get out of reading it. The subtitle is at least as important as the title because that last bit—what people will get from your book—is the only thing that will actually sell it.