These terms pertain to the parts of an author's name.
APA reference lists are arranged alphabetically according to the main author's surname(s) followed by the initials of their first name(s).
It is sometimes difficult to distinguish between a middle name and two unhyphenated surnames (for example, whether author David Foster Wallace ought to be referenced as Foster Wallace, D. or Wallace, D. F). Here are some tips to help with this:
The title of a book should be italicised and written in sentence case.
Chapter in edited book
The rules for book titles (above) apply. However the title of the book chapter is not italicised and is written in sentence case.
However, if the title of the chapter contains the title of another work, the latter should be italicised and written in sentence case.
The title of the journal is italicised and is written in title case. However, the title of the article itself is not italicised and is written in sentence case.
See also in this guide: How do I reference a resource that lists no author?
Take heed of the slight variation to the above rules for in-text citation of resources with no clear author(s).
When directly referencing 2+ authors in text, use and (as this falls within your regular sentence).
When indirectly referencing 2+ authors within parentheses use &.
American Psychological Association (APA). (2010). Publication manual of the American Psychological Association (6th ed.). Washington, DC: Author.