In APA, how should the first line of the reference entry for a book be formatted?

The correct format for the first line of the reference entry for a book in APA style is flush left, with subsequent lines indented. This style is known as a hanging indent. The hanging indent allows readers to easily distinguish between multiple entries in a reference list, making it clearer and more organized. The first line being flush left ensures that the entry stands out, while the indented lines provide a simple visual cue for the continuation of that specific entry. This format is part of the general guidelines provided in the APA Publication Manual, which focuses on clarity and consistency in academic writing. Proper formatting not only adheres to these guidelines but also enhances the readability of a reference list.