(EN) Śrīmad-Bhāgavatam (Bhāgavata Purāṇa) 12.4.2, su Bhaktivedanta Vedabase. URL consultato il 10 maggio 2020.
«One thousand cycles of four ages [catur-yuga] constitute a single day of Brahmā, known as a kalpa. In that period, O King, fourteen Manus come and go.»