It is believed that Bhaktivedanta Swami's most significant contribution are his books. Within the final twelve years of his life Bhaktivedanta Swami translated over sixty volumes of classic Vedic scriptures (such as the Bhagavad Gita, Chaitanya Charitamritaand the Srimad Bhagavatam) into the English language. For their authority, depth, and clarity, his books have won praise from professors at colleges and universities like Harvard, Oxford, Cornell, Columbia, Syracuse, Oberlin, and Edinburgh, and his Bhagavad-Gītā As It Is was published by Macmillan Publishers, in 1968 and unabridged edition in 1972, and is now available in over sixty languages around the world and some other books by Bhaktivedanta Swami are available in over eighty different languages. In February 2014, ISKCON's news agency reported to have reached a milestone of distributing over half a billion books authored by Bhaktivedanta Swami Prabhupada, since 1965.