Canon, Kristine Sampung magkakaibigan: kabilang sa seryeng matematika/ kwento ni Kristine Canon; guhit ni Ruben de Jesus. - Quezon City: Adarna House, c2008. - [30] p.: ill.; 23 cm. ISBN: 978-971-508-315-7 Subjects--Topical Terms: Children's stories. Dewey Class. No.: FIC C227 2008