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ed. Müller (original commentary of Sāyana in Sanskrit based on 24 manuscripts).
ed. Sontakke et al., published by Vaidika Samsodhana Mandala, Pune (2nd ed. 1972) in 5 volumes.
Rgveda-Samhitā Srimat-sāyanāchārya virachita-bhāṣya-sametā, ed. by Sontakke et al., published by Vaidika Samśodhana Mandala,Pune-9,1972, in 5 volumes (It is original commentary of Sāyana in Sanskrit based on over 60 manuscripts).
Adolf Kaegi, The Rigveda: The Oldest Literature of the Indians (trans. R. Arrowsmith), Boston, Ginn and Co. (1886), 2004 reprint: ISBN 978-1-4179-8205-9.
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Witzel, Michael (ed.), Inside the Texts, Beyond the Texts. New Approaches to the Study of the Vedas, Harvard Oriental Series, Opera Minora vol. 2, Cambridge: Harvard University Press, 1997