The noun Bible (capital B) is a proper noun as the title of the religious text of Christianity.
The noun bible (lower case b) is a common noun as a word for a book that is considered the most important one for a particular subject.
The noun 'bible' (lower case b) is a singular, concrete, common noun as a word for a book or publication that is considered an authority on a given subject.
The noun 'Bible' (capital B) is a singular, concrete, proper noun as a word for a book containing the scriptures of Judaism, Christianity, or other religions.
The singular possessive form of "bible" is "bible's."
God's Word
Holy Scriptures
Bible's. For example, "The Bible's opening verse is God's creation of the universe."(The plural would be "Bibles'." For example, "We bought ten Bibles. The Bibles' binding was of fine leather.")
The possessive form is Amos's.
The singular form is goose; the singular possessive form is goose's.The plural form is geese; the plural possessive form is geese's.
The singular possessive form of county is county's.
Quantum is singular, not singular possessive. The singular possessive form is quantum's.
The singular possessive form is week's.
The singular possessive form is contralto's.
The singular possessive form is aircraft's.
The singular possessive form is frontiersman's.
The singular possessive form is speculum's.
The singular possessive form is herd's.
The singular possessive form is heart's; the plural possessive form is hearts'.