H
heatherrae
Guest
Here are the definitions. Go slam the creator or Random House unabridged dictionary over the head with your book. I didnt' create the definitions. 
literature --
1. writings in which expression and form, in connection with ideas of permanent and universal interest, are characteristic or essential features, as poetry, novels, history, biography, and essays.
2. the entire body of writings of a specific language, period, people, etc.: the literature of England.
3. the writings dealing with a particular subject: the literature of ornithology.
4. the profession of a writer or author.
5. literary work or production.
6. any kind of printed material, as circulars, leaflets, or handbills: literature describing company products.
7. Archaic. polite learning; literary culture; appreciation of letters and books.
Myth --
1. a traditional or legendary story, usually concerning some being or hero or event, with or without a determinable basis of fact or a natural explanation, esp. one that is concerned with deities or demigods and explains some practice, rite, or phenomenon of nature.
2. stories or matter of this kind: realm of myth.
3. any invented story, idea, or concept: His account of the event is pure myth.
4. an imaginary or fictitious thing or person.
5. an unproved or false collective belief that is used to justify a social institution.
Myths aren't required to be in literature to be defined as myths. Read the definitions.

literature --
1. writings in which expression and form, in connection with ideas of permanent and universal interest, are characteristic or essential features, as poetry, novels, history, biography, and essays.
2. the entire body of writings of a specific language, period, people, etc.: the literature of England.
3. the writings dealing with a particular subject: the literature of ornithology.
4. the profession of a writer or author.
5. literary work or production.
6. any kind of printed material, as circulars, leaflets, or handbills: literature describing company products.
7. Archaic. polite learning; literary culture; appreciation of letters and books.
Myth --
1. a traditional or legendary story, usually concerning some being or hero or event, with or without a determinable basis of fact or a natural explanation, esp. one that is concerned with deities or demigods and explains some practice, rite, or phenomenon of nature.
2. stories or matter of this kind: realm of myth.
3. any invented story, idea, or concept: His account of the event is pure myth.
4. an imaginary or fictitious thing or person.
5. an unproved or false collective belief that is used to justify a social institution.
Myths aren't required to be in literature to be defined as myths. Read the definitions.