Lina Natamiharja and Evawati Sitorus, “PERBEDAAN PENURUNAN SKOR PLAK ANTARA MENGUNYAH BUAH APEL DAN JAMBU BIJI PADA SISWA SMP NEGERI: DIFFERENCE OF PLAQUE SCORE DECREASING BETWEEN CHEWING APPLE AND GUAVA IN GOVERNMENT JUNIOR HIGH SCHOOL”, Dentika Dental J., vol. 17, no. 3, pp. 260-263, Jul. 2013.