Charlotte Zolotow. (1990). Big Sister and Little Sister (First Edition.). HarperCollins.
Cita Chicago (17th ed.)Charlotte Zolotow. Big Sister and Little Sister. First Edition. HarperCollins, 1990.
Cita MLA (9th ed.)Charlotte Zolotow. Big Sister and Little Sister. First Edition. HarperCollins, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.