Calmenson Stephanie. The frog principal. Scholastic.
Chicago-čujuhus (17. p.)Calmenson Stephanie. The Frog Principal. Scholastic.
MLA-čujuhus (9. p.)Calmenson Stephanie. The Frog Principal. Scholastic.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.