Sills, B. (1976). Bubbles: A self-portrait / by Beverly Sills. Bobbs-Merrill.
Chicago-Zitierstil (17. Ausg.)Sills, Beverly. Bubbles: A Self-portrait / by Beverly Sills. Indianapolis [u.a.]: Bobbs-Merrill, 1976.
MLA-Zitierstil (8. Ausg.)Sills, Beverly. Bubbles: A Self-portrait / by Beverly Sills. Bobbs-Merrill, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.