Levins, S., & Langdo, B. (2010). Do you sing Twinkle?: A story about remarriage and new family. Magination Press.
Chicago-viite (17. p.)Levins, Sandra, ja Bryan Langdo. Do You Sing Twinkle?: A Story About Remarriage and New Family. Washington, D.C: Magination Press, 2010.
MLA-viite (9. p.)Levins, Sandra, ja Bryan Langdo. Do You Sing Twinkle?: A Story About Remarriage and New Family. Magination Press, 2010.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.