The institution of the "Baruch HaShem leOlam / Yiru Eineinu" blessing
Verses in Tanach
Talmud / Midrash and commentaries
Berachot 4b [interruption between Geulah and Tefillah]
Tosafot Berachot 2a "Mevarech" [why it was instituted]
Tosafot Berachot 4b "deAmar" [how it became a Berachah; interruption between Geulah and Tefillah]
Tosafot Berachot 27b "veHilchita" [interruption between Geulah and Tefillah]
Tosafot Megilah 23a "Keivan" [why we have Kaddish after the Berachah]
Tosafot Pesachim 104b "Chutz" [Berachah haSemuchah laChavertah]
Rabbeinu Yonah Berachot 2b [many issues]
Rashba Berachot 4b [saying the Berachah nowadays]
Post Talmud / Midrash, Pre-Rishonim
Mishneh Torah and commentaries
Seder Tefillos Kol haShanah - includes an alternate version for the closing paragraph
Rishonim [Pre-"Code of Jewish Law"]
Tur, Shulchan Aruch ["Code of Jewish Law"] and Commentaries
Tur Orach Chaim 236 [why it was instituted]
Tur Orach Chaim 267 [Friday nights and Yom Tov nights]
Mishneh Berurah 236:11
Acharonim [Post-"Code of Jewish Law"]
Chayyim Shaal 1:99 [Saying the Berachah nowadays]
Meishiv Davar 1:12 [Explaining an apparent contradiction between Tosafot]
Shut haChida 6 [Saying the Berachah nowadays]
Recent Authorities
Igrot Moshe Orach Chaim 2:102 [Changing one's custom]
Igrot Moshe Yoreh Deah 3:96 - [Serving as Chazan in a Minyan which has a different custom]
To add sources or to suggest topics for source material, please e-mail me [Mordechai Torczyner] at: 
. All submissions are welcome and encouraged, and will be credited!
