Richard Swift (December 1976). "Symphony no. 6 (1966) by Roger Sessions; Symphony no. 8, op. 106 by Vincent Persichetti". Notes. Second Series. 33 (2): 406–407. doi:10.2307/897603. ISSN0027-4380. JSTOR897603. OCLC45595520. (subscription required)
Richard Swift (December 1976). "Symphony no. 6 (1966) by Roger Sessions; Symphony no. 8, op. 106 by Vincent Persichetti". Notes. Second Series. 33 (2): 406–407. doi:10.2307/897603. ISSN0027-4380. JSTOR897603. OCLC45595520. (subscription required)
"News Section". Tempo. New Series (121): 49. June 1977. ISSN0040-2982. OCLC1767255.; Andrea Olmstead, Roger Sessions: A Biography (New York: Routledge, 2008): 347, 357. ISBN978-0-415-97713-5 (cloth); ISBN978-0-415-97714-2 (pbk); ISBN978-0-203-93147-9 (ebook). However, an anonymous item, "Concerts Mark Sessions' 70th", in Billboard (December 24, 1966): 41, states "Last month [i.e., November 1966], the first complete performance of his 'Symphony No. 6' was given by the New Jersey Symphony."
Richard Swift (December 1976). "Symphony no. 6 (1966) by Roger Sessions; Symphony no. 8, op. 106 by Vincent Persichetti". Notes. Second Series. 33 (2): 406–407. doi:10.2307/897603. ISSN0027-4380. JSTOR897603. OCLC45595520. (subscription required)