The book of Tobit.

Counted among the apocrypha.

Attributed author(s).
Anonymous, Tobit.

Text(s) available.
None on site.
Swete LXX (Greek only).
HTML Bible: Tobit 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 (Latin Vulgate only).
Humanities Text Initiative: Tobit (English only).
Kata Pi LXX: Tobit 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 (Greek and English).
Kata Pi: Tobit (S) 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 (Greek and English).
Sacred Texts: 1 Esdras 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 (polyglot).

Useful links.
Tobit in the Jewish Encyclopedia.
Tobias (Tobit) and the apocryphal books in the Catholic Encyclopedia.
Tobit at Kata Pi (Oesterly and Robinson).

The book of Tobit is counted among the apocryphal books of the Old Testament.

The book is not extant among the Hebrew scriptures, but rather in the Septuagint, abbreviated LXX.