Menachos9: 7
כָּל  קָרְבְּנוֹת הַצִּבּוּר אֵין בָּהֶם סְמִיכָה, חוּץ מִן הַפָּר הַבָּא עַל כָּל הַמִּצְוֹת וְשָׂעִיר הַמִּשְׁתַּלֵחַ. רַבִּי שִׁמְעוֹן אוֹמֵר: אַף שְׂעִירֵי עֲבוֹדָה זָרָה. כָּל קָרְבְּנוֹת הַיָּחִיד טְעוּנִים סְמִיכָה, חוּץ מִן הַבְּכוֹר, וְהַמַּעֲשֵׂר, וְהַפֶּסַח. וְהַיּוֹרֵשׁ סוֹמֵךְ, וּמֵבִיא נְסָכִים, וּמֵמִיר.
No communal offerings require leaning, except the bull which comes for any of the commandments and the he-goat designated to be sent [to Azazel]. R’ Shimon says: Even the he-goats for idolatry. All offerings of individuals require leaning, except for the bechor-offering, the maaseroffering, and the pesach-offering. An heir performs leaning, and brings libations, and makes a temurah exchange.
Menachos9: 8
הַכֹּל סוֹמְכִין, חוּץ מֵחֵרֵשׁ, שׁוֹטֶה, וְקָטָן, סוּמָא, וְנָכְרִי, וְהָעֶבֶד, וְהַשָּׁלִיחַ, וְהָאִשָּׁה. וּסְמִיכָה שְׁיָרֵי מִצְוָה; עַל הָרֹאשׁ, בִּשְׁתֵּי יָדַיִם. וּבַמָּקוֹם שֶׁסּוֹמְכִין שׁוֹחֲטִין, וְתֵכֶף לִסְמִיכָה שְׁחִיטָה.
All must perform leaning, except for a deaf-mute, an imbecile, a minor, a blind man, a non-Jew, a slave, an agent, and a woman. Leaning is [considered] a remainder of the precept; [it is done] on the head, with two hands. In the place where the leaning is performed [the animal] is slaughtered, and the leaning immediately precedes the slaughtering.