This wiki uses the standard abbreviations recommended by the Society of Biblical Literature as shown after the book name(s) below.

Genesis | Gen
Exodus | Exod
Leviticus | Lev
Numbers | Num
Deuteronomy | Deut
Joshua | Josh
Judges | Judg
Ruth
1–2 Samuel | 1–2 Sam
1–2 Kings | 1–2 Kgs
1–2 Chronicles | 1–2 Chr
Ezra
Nehemiah | Neh
Esther | Esth
Job
Psalms | Ps(s)
Proverbs | Prov
Ecclesiastes (Qohelet) | Eccl, Qoh
Song of Songs (Song of Solomon, Canticles) | Song, Cant
Isaiah | Isa
Jeremiah | Jer
Lamentations | Lam
Ezekiel | Ezek
Daniel | Dan
Hosea | Hos
Joel
Amos
Obadiah | Obad
Jonah
Micah | Mic
Nahum | Nah
Habakkuk | Hab
Zephaniah | Zeph
Haggai | Hag
Zechariah | Zech
Malachi | Mal

Note: there is no standard order of these books, and different selections are recognised by different church traditions: see the pages on individual books for details.
Tobit | Tob
Judith | Jdt
Additions to Esther | Add Esth
Wisdom of Solomon | Wis
Ecclesiasticus (Wisdom of Ben Sira) | Sir
Baruch | Bar
Letter of Jeremiah | Ep Jer
1 Esdras | 1 Esd
2 Esdras | 2 Esd
Additions to Daniel, comprising:
The Prayer of Azariah and the Song of the Three Youths
Susanna
Bel and the Dragon
1 Maccabees | 1 Macc
2 Maccabees | 2 Macc
3 Maccabees | 3 Macc
4 Maccabees | 4 Macc
Prayer of Manasseh | Pr Man
Psalm 151 | Ps 151