Minor, Robert N. (1982). Bhagavad Gita: An Exegetical Commentary. South Asia Books. pp. L–Li. ISBN978-0-8364-0862-1.; Quote: "The current text of the Bhagavad gita is well-preserved with relatively few variant readings and none quite serious. This is especially remarkable in the light of the numerous variants for the remainder of the Mahabharata, some of which are quite serious. Secondary insertions are found in individual manuscripts of the Gita, but these are clearly secondary. The number of stanzas in the Gita is 700, a number confirmed by Shankara, and possibly deliberately chosen in order to prevent interpolations."
