Sills, B. (1976). Bubbles: A self-portrait / by Beverly Sills. Bobbs-Merrill.
Citazione stile Chigago Style (17a edizione)Sills, Beverly. Bubbles: A Self-portrait / by Beverly Sills. Indianapolis [u.a.]: Bobbs-Merrill, 1976.
Citatione MLA (8a ed.)Sills, Beverly. Bubbles: A Self-portrait / by Beverly Sills. Bobbs-Merrill, 1976.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.