Musannaf Ibn Abi Shaybah

Hasan says that whoever prays alone, or with congregation, or offers voluntary prayers, should say the takbeerat.

Ibrahim says that he will say the takbeerat only after the congregational prayer.

Hazrat Hammam states that whoever prays alone during the days of Tashreeq should also recite the Takbeerat.

Hazrat Sha'bi says that say the takbeer even in voluntary prayers, whether you are praying alone.

Hazrat Mujahid says that during the days of Tashreeq, one should recite the Takbeerat after every obligatory and voluntary prayer.

Hazrat Mujahid states that on the Day of Sacrifice, the predecessors used to recite the Takbeerat after every two rak‘ahs.