(2006). Numbers in a row: An Iowa number book / written by Patricia A. Pierce ; illustrated by Dorothia Rohner.
Chicago-viite (17. p.)Numbers in a Row: An Iowa Number Book / Written by Patricia A. Pierce ; Illustrated by Dorothia Rohner. 2006.
MLA-viite (9. p.)Numbers in a Row: An Iowa Number Book / Written by Patricia A. Pierce ; Illustrated by Dorothia Rohner. 2006.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.