Funk & Wagnall's New Encyclopedia Yearbook 1986 by Norma H. Dickey Funk & Wagnalls - January 1, 1987
Page 287:
Cowsill, Barbara C., 56, American singer who with six of her children formed the 1960's soft-rock group known as the Cowsills that recorded such hits as "We Can Fly" and the title song of the musical Hair. January 31 in Tempe, Ariz.