The Mamas and the Papas released it in 1966, it has been covered by Nancy Sinatra, The 5th Dimension and one or two other “Beach Boys” style cover bands. I am not aware of a girl group from the Eighties releasing a cover. Wiki claims it was released in 1965, but Rolling Stone claims 1966. I recall it from 1966, I had just started high school and remember it well.