Should the title of a book in a report be italized and underlined?

No. It is either italicized according to the APA rules (American Psychological Association) or underlined according to MLA rules (Modern Language Association), but never both.

在报告中，书籍的标题通常应该用斜体表示，而不应该加下划线。这是国际上常用的引用格式之一。