Cita APA (7th ed.)

PARRAGON BOOKS. MY FIRST COUNTING BOOK. PARRAGON PUBL.

Cita Chicago (17th ed.)

PARRAGON BOOKS. MY FIRST COUNTING BOOK. PARRAGON PUBL.

Cita MLA (9th ed.)

PARRAGON BOOKS. MY FIRST COUNTING BOOK. PARRAGON PUBL.