Buffy Sainte-Marie  (born February 20, 1941) is a Canadian-American Cree singer-songwriter, musician, composer, visual artist, educator, pacifist, and social activist.  Throughout her career in all of these areas, her work has focused on issues of Indigenous peoples of the Americas.  Her singing and writing repertoire also includes subjects of love, war, religion, and mysticism.   (More from Wikipedia)

Songwriting credits were not handled so scrupulously back then anyway, and those practices continued at least through the end of the 1960’s.  I have already mentioned in previous posts that Buffy Sainte-Marie showed her own name as the songwriter of “You’re Going to Need Somebody on Your Bond” on her debut album It’s My Way!; and that Deep Purple claimed to be the writer of “Hey Joe” on their 1968 debut album, Shades of Deep Purple (the musical bridge before the song was their work, but “Hey Joe” had already been a hit song several times by then).