Widiyaningsih, Endang Nur, et al. “STUDI HUBUNGAN KADAR PROTEIN DENGAN KADAR HEMOGLOBIN PADA SISWI DI SMA N 2 SUKOHARJO”. Prosiding University Research Colloquium, May 2021, pp. 307-10, https://repository.urecol.org/index.php/proceeding/article/view/1413.