Reference for Moed Katan 3:6

רַבִּי אֱלִיעֶזֶר אוֹמֵר, מִשֶּׁחָרַב בֵּית הַמִּקְדָּשׁ, עֲצֶרֶת כְּשַׁבָּת. רַבָּן גַּמְלִיאֵל אוֹמֵר, רֹאשׁ הַשָּׁנָה וְיוֹם הַכִּפּוּרִים, כָּרְגָלִים. וַחֲכָמִים אוֹמְרִים, לֹא כְדִבְרֵי זֶה וְלֹא כְדִבְרֵי זֶה, אֶלָּא עֲצֶרֶת כָּרְגָלִים, רֹאשׁ הַשָּׁנָה וְיוֹם הַכִּפּוּרִים כְּשַׁבָּת:

R. Eliezer says: From the time of the destruction of the Temple, [i.e., Now that the festival offerings of Shavuoth cannot be made up all seven days, it is not considered a festival, but] Shavuoth is like Shabbath, [which does not interrupt [mourning. But in the time of the Temple, when one who did not celebrate the first day of Shavuoth, could celebrate all seven, as with Pesach, Shavuoth was like Pesach even vis-à-vis mourning.] R. Gamliel says: Rosh Hashanah and Yom Kippur are like the festivals. The sages say: Neither as this one nor as the other; but Shavuoth is like the festivals and Rosh Hashanah and Yom Kippur are like Shabbath. [As to the halachah: Shavuoth, nowadays, is like the festivals (Pesach and Succoth), as are Rosh Hashanah and Yom Kippur. If one's kin died even a moment before one of these, the decree of shivah falls off. And if he died seven days before one of these yomim tovim, the decree of shloshim falls off, as stated. And the seven days of the festival are included in the shloshim. For even though we learned: "Festivals interrupt and are not included," they are not included in the shivah, but they are included in the shloshim — making fourteen days. And Shemini Atzereth is a festival in itself and counted as if it were seven days — making twenty-one days; so that he counts another nine days and this suffices (to complete the shloshim). The decree of shivah: A mourner, all seven days, may not bathe, even part of his body, in warm water, and all of his body, in cold water. He is forbidden to wash his clothing, to anoint himself, to wear shoes, to cohabit, to do work, and to greet people. He must wrap his head (in mourning), he must turn over all of the beds in the house on the ground and sleep in them and not on an upright bed. He may not cut his nails with an instrument, nor the hair of his moustache, even if it interferes with his eating. He is forbidden to read in the Torah, both the written or the oral. He may not baste the rent of his garment. The decree of shloshim: From shivah until shloshim he may not wear a new garment or an ironed white garment, he may not cut his hair, he may not partake of a mundane (non-mitzvah) repast, he may not go out to trade with his friends, he may not take a wife if he already has a wife and children, and he may not sew up his (mourner's) rent.]

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