The Right to Author Liturgy
See also under Piyyutim [Poems] in the Service
Verses in Tanach
Talmud / Midrash and commentaries
Berachot 28b
Megilah 17b-18a
Yerushalmi Berachot 2:4
Post Talmud / Midrash, Pre-Rishonim
Mishneh Torah and commentaries
Hilchot Tefillah 1:3-10; 2:1
Rishonim [Pre-"Code of Jewish Law"]
Tur, Shulchan Aruch ["Code of Jewish Law"] and Commentaries
Tur, Shulchan Aruch Orach Chaim 112
Bei'ur Halachah Orach Chaim 101 s.v. Yachol
Magen Avraham Orach Chaim 101:5
Acharonim [Post-"Code of Jewish Law"]
Recent Authorities
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