capitalization - "Not" or "not" in book title?

Assume I have written a book and want to name it:

The Joy of Not Being Stupid

Would the "not" be capitalized?

Answer

Blue book of grammar and punctuation: The following rules for capitalizing composition titles are universal.

•Capitalize the title's first and last word.
•Capitalize verbs, including all forms of the verb to be (is, are, was, etc.).
•Capitalize all pronouns, including it, he, who, that, etc.

•Capitalize the not.

Do not capitalize a, an, or the unless it is first or last in the title.

•Do not capitalize the word and, or, or nor unless it is first or last in the title.
•Do not capitalize the word to, with or without an infinitive, unless it is first or last in the title.