EBOOK_FORMATS_WITH_COVERS = ['pdf', 'epub', 'mobi']
EBOOK_FORMATS = EBOOK_FORMATS_WITHOUT_CHILDREN + EBOOK_FORMATS_WITH_CHILDREN
EBOOK_FORMATS_WITH_COVERS = ['pdf', 'epub', 'mobi']
EBOOK_FORMATS = EBOOK_FORMATS_WITHOUT_CHILDREN + EBOOK_FORMATS_WITH_CHILDREN